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Discussion Starter · #1 ·
Hey Guys, I would really like to build up a Karate Monkey, but UNFORTUNATELY, I am a bit concerned about the weight. I really love the idea of a steel 1x9. We have a fully geared KM built up in the shop and it tips the scale at around 32lbs :eekster: using low(er) end parts.

Now I realize that its a steel bike and just the frame weighs 5.34 pounds (size 18), but what have some of your KM builds come out to be? Is >25lbs easily doable?

Photos, builds and weights WELCOME!

This is what I would eventually like to have:

XTR Crank with Single ring
990 Cassette
XTR Rear Der
Stans Arch/Hope Wheelset
BB7s
Reba SL Eventually
 

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I'll be interested to see the response you get.

For comparrision, what parts are on the 32 lbs KM in your shop? Stock fork or suspension? Wheelset? (I'm guessing those two make the biggest difference) Any unusually heavy parts like a Brooks saddle, steel handlebar, Honjo fenders, or something like that?
 

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I ride mine single speed & rigid. Never weighed it - not a concern for me. Feels great & rides great even on the nasty tech. rocky stuff on my local trails.
 

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My rigid singlespeed was in around 25lbs without any weight weenie parts. I'm sure with lightish wheels/tires and nothing overly heavy you could do a 25lb geared monkey without too much trouble.
 

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My rigid SS KM is 25lbs with lighter parts. XTR M970 crankset, Moots post, Devo Ti saddle, On One carbon fork. BB7, XDX tires (tubeless), Flow rims on Surly hubs. You should just get a lighter frame. They're tanks.... but the positive to that is.... they're tanks.
 

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Discussion Starter · #6 ·
I agree with you guys, I'm not looking for an ultra light build, but I just DO NOT want a 30lb+ bike. 25lbs would be good with me.

Schmucker... any pics?
 

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I'd imagine that with the parts you're planning to use that you'd be in that window of 25 lbs. I've seen someone's on here that was 23 lbs. I believe. I think it had a fox fork, 27 speed and was green. Hopefully he'll speak up, I know he is a frequent contributor here.

Although a bit heavier, I love my KM. Among my friends, I am notorious for buying and selling bikes but my KM I've had for years and will continue to. It's so versatile and smooth. It's perfect.

Here's a pic of it in current winter commuter build. 1x9 with mary bars and fenders. Kind of emasculated in that form, that's why I'm building up a cross-check. No idea of the weight.
 

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I weighed mine with my Wii Fit. It says im tipping the scales at 27lbs for an XL frame. A new set of Stans Flows with Stans hubs are in the mail, and the new x9 shifter and derailleur are in place for its conversion to 1x9. Im guessing the lighter wheel set and added gears will even each out, but what do I care? This thing is a monster truck, and i ****ing love it. :thumbsup:

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ADDam said:
Hey Guys, I would really like to build up a Karate Monkey, but UNFORTUNATELY, I am a bit concerned about the weight. I really love the idea of a steel 1x9. We have a fully geared KM built up in the shop and it tips the scale at around 32lbs :eekster: using low(er) end parts.

Now I realize that its a steel bike and just the frame weighs 5.34 pounds (size 18), but what have some of your KM builds come out to be? Is >25lbs easily doable?

Photos, builds and weights WELCOME!

This is what I would eventually like to have:

XTR Crank with Single ring
990 Cassette
XTR Rear Der
Stans Arch/Hope Wheelset
BB7s
Reba SL Eventually
It's possible to get the weight down, but it will cost you. My suggestion is to make sure you are running a wheelset that is at least 1600g light. I would ditch those Hope hubs and go lighter with DT Swiss 240's or American Classic hubs. I would ditch the boat anchor 990 cassette and get the XTR. BB7's are not stock light, so if you trim 'em by running lighter rotors (such as 160f/140r Ashima Serrated rotors), with Jagwire cables/housing and some light levers - you can be at 400g per side.

If you have a target weight, I would plug in all the weights of the components you are considering into an Excel spreadsheet so you can see the final weight build. It's always about the components starting with the wheel weight.

My size XL Karate Monkey in the following pictures weighs 23.9 lbs. without going crazy weight weenie on it and running a 2 x 9 drivetrain (no granny).





However, as you see in the picture, that 23.9 is with V-Brakes. American Classic non-disc wheels at 1600g converted tubeless with Stans standard 26" rimstrips and sealant. Middleburn 180mm Duo cranks with the SRAM twist shifts, an older XT front derailleur, X.9 rear, two Bontrager XR 2.25 front tires (run it on the rear as well), Thomson post and stem, King headset, WTB saddle Bontrager Race handlebar, SRAM grips, Avid Ti brakes/levers, Kool Stop pads, Shimano SPD cheaper and heavy pedals, Race Face heavy ISIS BB, Salsa skewers, Surly seatpost collar, some cheap and heavy bottle cage.

If I throw all my weight weenie parts on it, I can get it down much lower with no problems. Now if you add in disc brakes and a Reba, the weight gain will start. The Karate Monkey fork weighs 1180g. A Reba will average around 1780 - 1810, so that's about an additional 1.38 pounds for the suspension. (You could also go the other direction and get a lighter fork such as one of the carbons from Pace, White Brothers, etc....). I don't mind the KM fork though for my needs since I ride an XL and the fork gives more for us larger sized riders than it does in the smaller sizes. Depending on final weight of your BB7's, the weight gain over V Brakes must be considered as well. I'll use my usual set up of the Alligator serrated 160/140, Speed Dial Levers, Jagwire housing and call it 800 - 820g compared to the Avid Ti V-Brakes which are 330g for the pair, plus housing/cables 78g and Levers 180g for a total of 588g will cost another 1/2 pound. If just running a stock BB7 kit with cables/housing and levers - you're probably looking at 990 - 1000g which is .9 lbs over the V-Brake set up. Hence, my suggestion of tuning them down with rotors/housing and light levers. Or running a lighter disc brake set to begin with for your build.

Without changing anything else but the brakes and fork (as well as swapping for the disc American Classic wheels which I also own and they weigh the same), the bike in XL size with the gear I have on it would weigh 25.79 lbs. And that's without really hand picking some lighter weight components.

So I say yes - it is absolutely within reason to come in at or around 25 lbs with the KM, a suspension fork and disc brakes.:thumbsup: The size 18" frame is obviously a tad lighter than my size 22" frame.

BB
 

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Discussion Starter · #13 ·
Thanks for that post Bruce, it was very helpful and encouraging. :thumbsup:
 

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Hey ADDam, I also live in A2! Say hi to Scott and Craig for me.

My KM weighs about 26 lbs built up 1x9. That is with decent parts, but not much weight weenie stuff. There is at least one pound with light weight parts, but still not serious weight weenie parts.

Don't put too much stock in the weight of the KM frame. If you took the parts from your friend's 32 lb KM and put them on a Niner Air 9 frame, it would still weigh about 30 lbs.

Ed
 
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