Hammerschmidt isThe newTruvativ cranksetThat hasThe industryTalking. Its single internal gear design offersThe same range as a wide-range 2 ring crank and front derailleur, with none ofThe complexity. Stop missing shifts and quit wastingTime cleaning a mucked-up drivetrain. Its like a double crank, front derailleur, and chain guide in one! Can only be installed on frames with ISCG or ISCG 05 chainguideTabs Can work with singlespeed, 7, 8, or 9 speed chains (matchThe chainTypeTo your rear cl
Strengths: Flawless any time shift (forward pedaling, reverse pedaling, coasting, standing still, under load). High ground clearance. Chain drop/suck nearly impossible. Cross shift all you want! Last minute shift if you didn't plan ahead. Shorter armed rear derailleur and shorter chain required (more crisp rear shifting as a result). Does not go out of adjustment once set up correctly. Can mount on ISCG frames that are not front derailleur compatible.
Weaknesses: A bit heavier than the comparable 2x AM setup. Noisy when hucking. Hums when in high gear. Expensive. Replacement parts expensive, but what high end component isn't? Requires ISCG or ISCG 05 compatible frame and that the tabs are properly faced.
Bottom Line:
I've always been happy with my 2x9 setup up on my trail bikes. I don't race and am not a speed demon on the downhill runs, so I seldomly using the big ring. Came across an awesome deal $300 for a mounted but never ridden set in box, so I though I'd give it a shot for my 2010 Specialized Enduro Comp I also picked up a the same bike swap.
FRAME PREP and INSTALLATION:
Initially, after reading the detailed section about frame preparation from the printed manual, I had some concerns that the LBS won't mess up my frame doing the ISCG facing improperly. It turns out that the tech knew what he was doing, and the facing came back perfectly within spec. Apparently, my ISCG tabs were almost a full mm off perpendicular from the bb axis. On the Enduro, the BB-ISCG-rear triangle pivot is one giant casting, and as such, you'd imagine the ISCG tabs would be pretty close to perpendicular with the BB axis, but no. The spacing washers that came with the crankset can accomodate a variety of BB-to-ISCG offsets (including flush). Once I got the frame home, the installation took about the same time as a traditional crankset. One note, Truvative's instructions does not note that which direction the spindle should be oriented. I used common sense (correctly) and oriented the longer end towards the drive side. I wonder if the DVD instructions (included) are more detailed...whatever.
INITIAL RIDE
Weird. First of all, as expected the reversed shifter trigger assignments was very confusing. I've used X9 and X0 shifters for quite a while, only now it looks and feels like a X9 shifter, but the buttons do opposite of what you'd expect relative to the gearing. In the Hammerschmidt, high gear (1:1.6) is normal and low gear (1:1) is pulled (think rapid rise for the front). I guess I'll just get used to it eventually, but poor design choice Truvativ. Even a simple toggle would be superior here. Reversed trigger issue aside, the other immediate issue I had was that I'm so used to giving the cranks 1/2 a revolution unloaded between shifts that I didn't take full advantage of the instant shift qualities of the Hammerschmidt. Furthermore, when I did conciously maintain load, I found the transition jarring as the instant shift is really that, instant--like slipping the foot of the clutch in a car. It's also impossible to tell which gear you're in just by looking. Another observation which really is a non-issue is the whining in high gear. This is normal, and I'm not so much bothered by it as annoyed by having to explain to nearby fellow riders why my bike make sounds. Lastly, when doing any kind of drops, some internal parts make noise, and I can notice this over the noise of the chain slap in the rear.
AFTER AN HOUR
The reversed trigger still confused me unless I thought about it consciously. I've started to tune out the extra noises and began to focus on the actual drive train performance as it relates to the riding. I LOVE it! The particular trails are essentially giant rollers--constant climbing followed by constant descents and repeat. In the past, I've always had to concentrate on when to shift and and plan ahead. Even with years of experience, sometimes I still lapse and find myself in the wrong ring up front. Now, I simply stay in high gear and pop it into low when I need it last minute. This way I can shoot up the hill much farther before the extend climb starts. Similarly, for the descent, I can now pedal through the rocks at the peak, start my tuck then shift up while beginning my downhill coast instead of having to spend time/distance making sure I've finished shifting to the big ring before my tuck. While doing some technical flat grade riding through a field of rocks, I was beginning to abuse the shifting by popping to high gear in between rocks (like 10 feet) and back to low once my front wheel got back up on the next rock. That's a bit excessive, but it's doable for whatever reason. I also welcomed the remarkable ground clearance. It's essentially the diameter of a 24-toothed ring!
AFTER A FEW RIDES:
Got used to the reversed trigger but still unsure at times which gear I'm in, but a quick flick of the trigger clears that right up. I'm totally getting spoiled by the instant shifting though. I find my self now shifting the front more than the rear if you believe that! I've got about 50 miles on it now and it works just as the day I installed it. No adjustments at all. It just works period. Both set of ratchet rings are each engaged by 3 pawls. The beauty of the design is that the 1:1 low gear loads the larger of the two ratchet rings which is about 3" diameter. This would exceed even that of some of the best hubs/freewheels out there in terms of load capacity. Plus, all the parts are user serviceable.
SHORT TERM VERDICT
Debatable at MSRP, but a definite YES YES YES at $300 and if you're not a weight weenie.
Submitted by
neotym
a All Mountain Rider
from Pasadena, CA USA
Date Reviewed: March 15, 2012
Strengths: I'm riding the Hammerschmidt AM and it is amazing!
As for the weight factor, note that when you take into account the loss of a large chainring & front derailleur coupled with the heightened ground clearance & add the efficiency of the Hammerschmidt... it's a huge plus!
While it does make a light whirling buzz sound in the 1:1.6 ratio I can discern NO drag. I really think people are hearing that (rather minor, certainly not loud as some say) sound and interpreting it as drag. I feel none). It was a bit louder for my first 2-3 rides but now is a non-factor. The sounds are not a distraction at all for me, in fact I use the louder clicking sound made by pedaling backwards in the 1:1.6 ratio to let people know I'm coming on curvy DH switchback trails. Very useful & only makes this sound when pedaling backwards.
Weaknesses: None so far.
Bottom Line:
Two thumbs up from this SoCal all mtn rider. (For reference, I ride 5-6 days/wk with rides consisting of 3-4 mile climbs of 1200-2000 ft. of vertical. Then technical singletrack trails [often rocky w/ drop-offs] back down - for me the HS is perfect)
Similar Products Used: There is nothing similar to the HS (not withstanding internal gearbox set-up... crazy money for those). I also ride a Shimano XT Hollowtech crank on my XC bike.
Bike Setup: IH 6 Point (17"), Marzocchi 55 Micro Ti (160mm) fork, Fox DHX 3.0 shock, Sunline DH superlight 26" wheel set, Schwalbe Hans Dampf 26x2.35 tires, Hammerschmidt AM crank, Sram X.9 short cage rear der, Sram XO shifters, 12/36 cassette, Nukeproof Electon pedals, Crank Bros. AM seat, Magura Louise BAT brakes.
Overall Rating:
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Submitted by
kameraguy
a Weekend Warrior
from San Jose, CA, USA
Date Reviewed: January 31, 2012
Strengths: Everything advertised is true. Shift anytime you want, load independent. Integrated chain retention. More clearance than a traditional bash guard.
Weaknesses: HEAVY. Freewheel "rattle" as others mentioned. Spendy (but if you think about how much a nice traditional crankset costs, the extra cost is not too much given all the advantage IMHO).
Bottom Line:
Let me start off saying the rattling sound when you freewheel is audible, but not nearly as annoying as some make it out to be. Of course it would be nice to be quieter, but really, it's not that big a deal. Also, the drag in the overdrive mode is NOT THAT BAD too. Is it there, sure. But I honestly don't notice. Then again, I'm not doing XC races so perhaps I'm less critical over efficiency.
Prior to running the Hammerschmidt, I had a single-ring setup. This was light and I never dropped a chain but I also had less success clearing climbs.
I didn't want to run a traditional front derailleur, so I looked into the Hammerschmidt as a good alternative. Found a great deal on it and it has been a godsend.
Simply put: I absolutely LOVE it. It was one of the best purchases I made for my bike aside from converting to gravity dropper seatposts. If you can think of it this way: neither is really "necessary", but they make a positive improvement to your fun and performance.
With the hammerschmidt, all the advertised features are legit. Shifting is perfect. So fast. Anytime. Clearance for obstacles is impressive. Chain retention is also addressed with a variable top plate.
One caveat: make sure you buy the right version that matches your ICG tab spacing. I made the mistake and got the wrong kind, but fortunately my LBS was able to order the replacement back plate to address the problem.
It's going to add a pound or two to your bike if coming from a standard crankset. But obviously this is no light-weight part.
The crankset seriously rocks. If you hate front derailleurs more than extra weight, this is the best way to go if you want more than one gear up front. No complaints so far. It has worked flawless for me. Now if only they would make a lighter version, but I have no idea if they are even pursuing development anymore...which is a shame if so because this is an awesome piece of kit.
Bike Setup: 2011 Canfield One, all XO drivetrain (including XO Hammerschmidt shifter), I9 endure wheelset, 2011 Marzocchi 66 RC3 Evo Ti, 2011 X-Fusion Vector HLR with Ti spring, Chromag cockpit, Canfield Crampon pedals, KS dropper seatpost.
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Submitted by
specialev
a Cross Country Rider
from Renton, WA, USA
Date Reviewed: June 30, 2011
Strengths: On the fly shifting, fantastic clearance, sealed assembly
Weaknesses: Heavy and noisy
Bottom Line:
This came on a bike I bought used from a friend and now I couldn't imagine using anything else. The on the fly shifting and clearance makes up for the weight gain you suffer. I haven't had any maintennance issues with it yet though after a year the bash guard has a crack...need to replace that.
Strengths: ground clearence, instant shifting(even while not pedaling), no dropped chains, short cage derrailur compatable
Weaknesses: requires constant cleaning & maintinence, slight drag in OD, not compatable with all frames with ISCG tabs (such as some frames with 150mm swingarms)
Bottom Line:
despite the downfalls I honestly don't think I could ride another mountain bike without the HS - it simply makes the ride more enjoyable with the instant shifting it provides
Bike Setup: Lenz Behemoth 150mm rear with custom internal Hammerschmitd spacers to get the system to be compatable
Overall Rating:
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Submitted by
jim.crabtree
a Weekend Warrior
from UK
Date Reviewed: April 21, 2011
Strengths: instant gear change, no more lost chain. Yay!
Weaknesses: poor sealing
planets wear out
ISIS drive side BB bearings wear to quick
Bottom Line:
I will struggle to go back to double chainring but the product needs love to keep it sweet.
I replaced the grease on a reasonably regular basis after making a tool to crack the thing open, but the planet gears have worn after only a year of use.
The drive side BB bearings also wear out very quickly, Sram would like to sell you a complete new BB but you can replace them individually (check Enduro bearings), again this is not good.
The problems don't quite make up for the strength of the product.
When working its fantastic but needs to be better developed before I would recommend.
Submitted by
haydo
a Weekend Warrior
from Auckland New Zealand
Date Reviewed: March 28, 2011
Strengths: Great ground clearance really simple construction for what it can do.
Weaknesses: Apart from the weight and the drag its pretty sweet.
Bottom Line:
Great product, but I worry it loads up the Hub free body and cassette when shifting under load which is a bit of a no no for standard gear.it's almost encouraged as a feature.
Similar Products Used: Well the only similar product would be a normal crankset ?
Bike Setup: 08 Bullit
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Submitted by
alexandermarin
a Weekend Warrior
from Boulder, Colorado
Date Reviewed: September 2, 2010
Strengths: Great clearance, can use ALL gear combinations 2 x 9, instant shift
Weaknesses: noisy in overdrive mode
Bottom Line:
Very happy with this crank. If installed correctly, i.e., chain ring in the middle of the cassette, you can use all the gear combinations. With the 22 in the front and a 11-34 (or 36) you get all you need for steep uphill to light downhill. The overdrive, unfortunately, is less compelling. The whirling sound of the internal gears is not much of a bother but the ratchet sound is pretty annoying. Not a problem when you just bomb down a more or less obstacle free fire road but on technical trails the ratchet is just constantly making rather loud clicking noises. When you do not turn the pedals, that is, just coast down some technical trail, every little obstacle triggers that annoying sound. This sound makes the Hammerschmidt sound more like a 99 cent carnival toy than the $500 professional equipment is it supposed to be. After some time you learn how to minimize the need for the overdrive. Overall still a great product but SRAM better finds a way to silence that ratchet.
Strengths: Shifts quicker that any front shifter out there. Nothing comes close. Shift anytime, weather pedaling or not. Lots of clearance, looks great. EASY INSTALL with great instructions with lots of detail and a DVD.
Weaknesses: None so far.
Bottom Line:
This is a great product. I could not even think about going back to a traditional front chain ring set-up. This is good for weekend warriors, downhill, free ride, etc. However, may be on t
Similar Products Used: Traditional front chainring set-ups.
Bike Setup: Intense Slope Style, Hope Brakes and hubs, Mavic 721, Sram X9 (10 Speed).
Overall Rating:
Value Rating:
Submitted by
Sherms
a Downhiller
from San Diego, CA, USA
Date Reviewed: August 31, 2010
Strengths: Instantaneous shifting, great ground clearance, very stiff, never cross chain again, looks awesome
Weaknesses: None really, but if you're picky, there is a bit of a winding sound when in overdrive.
Bottom Line:
I don't really see any weakness with the Hammy aside from the winding noise when overdrive is engaged. Just accept this as a given when using the Hammy. I'm not worrying about it. Nothing is perfect, but the hammerschmidt is pretty damn close to it.
Again, this is new tech, so it will take some getting used to. The upshift/downshift is backwards compared to a regular X9 shifter and pedaling with what equates to a 36t is a bit different, but will make you a stronger rider. I never have to worry about dropping a chain again or cross chaining. The setup allows me to go through my entire cassette in the 22t mode smoothly and easily transition to the 36t mode with no problem.
Shifting is near instantaneous and silent. Very little chainslap even when I'm on the 11t of the cassette. Since it has an integrated chain guide, I never once worried about dropping the chain. Usually when bombing down a long rock garden, I have to do a half pedal stroke somewhere just to make sure my chain hasn't dropped. Not with the Hammy. I was bombing down Barney Rubble @ Noble Canyon at DH bike speeds without fear of dropping the chain. Not once did I spank the bashguard on anything even though my DB Mission has a very low BB.
The hammerschmidt is a work of art that has people asking... "hey, can I try it out?" The most common comment after a short test ride is, "I want it."
Bottom Line... if your bike has ISCG tabs and you like to ride as fast and hard as you can. The hammerschmidt is for you. Just understand that it will take some getting used to. But once you change your riding paradigms, you'll be hooked.
Submitted by
Tbras104
a Cross Country Rider
from Asheville
Date Reviewed: March 26, 2010
Strengths: Instant shifting anytime, compact design, single ring security with built in bash and guide.
Weaknesses: None when riding flats... with clipless pedals I have hit my ankle on the crank from time to time. I have made some cleat adjustments, and think that this issue is solved. There is also some "drag" or "resistance" when in overdrive, but it is not noticable unless climbing.
Bottom Line:
This product has been great for the type of riding that I do. I like to ride anything that the trail throws my way, as well as some light freeride stuff. Being able to shift under load, or standing still, or whenever I want has been great. For the rider who has to pedal to the top of whatever he/she wants to ride down, but isn't racing to get there, the Hammerschmidt is the ticket. Now you can decide at the last second you want to change gears. I have been really happy with the ground clearance, and security that this setup has provided also.
Bike Setup: Transition Covert with DHX-Air, Float 160RC2, and Hammerschmidt.
Overall Rating:
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Submitted by
eastongeneral
a Cross Country Rider
from Oregon
Date Reviewed: March 5, 2010
Strengths: Shifts without pedaling. Great clearance.
Weaknesses: In overdrive you lose power in the transmission only really noticeable on sustained big ring climbs. I've heard that loss is on the order of a few percent which is huge on long rides. Shifts almost too quickly
Bottom Line:
I wouldn't use this product on a AM/trail bike. It would seem that the fast shifting would be good for techy trail riding with punchy climbs but I ran into a couple issues. A normal crankset will only shift in your power stroke. This shifts anywhere so if you throw it up into the overdrive when you are in a dead spot of your stroke, your feet will stop turning and fly off the pedals (if you ride flat pedals). This only happens in certain cases where you up shift a little early (before you actually have the power to turn that higher gear in anticipation of having that power soon ie. hill crest). If you are in too high a gear in the rear, the shift to overdrive causes an instant huge jump in gear ratio. I found myself shifting with both hands a lot to try and prevent this. The other issue is a combination of the first two. Since you lose efficiency in the overdrive, I would always try to use the little cogs (11t 13t) in the back on fast pedaly sections rather than going into the overdrive. When you are in the 11 tooth cog in the back then you hit the overdrive it is a huge jump and you are instantly underpowered for your gear selection. So again, I always found myself shifting with both hands at once. Not that that is a huge deal but its kinda of a pain in the ass to shift 4 gears in the rear and spin out for a second in anticipation of hitting the overdrive to get back where you want to be. If you are a freerider or DHer and the alternative is a single ring go for it but its not that cool for trail riding. It's sweet to f around with in the parking lot and the clearance is great but I'll keep my XT double at less than half the price in for the trail.
