I am similar size and went for a medium. Pretty much perfect for me but I guess you need to factor in what sort of riding you will be doing?

 

Yes, you are on the edge. Do you have a long torso, short legs, long legs,short torso? I am 5 9" and ride a Med. I have a equally proportioned body and my Ibis seat post is within 5c of being maxed. You should definitely demo one if possible. Get the right size it is worth the extra effort.

 

Thanks Steevdee and MilesW... I suppose I have an equally proportioned body.

Steevde - I ride flowy technical cross country trails mostly. No big drops.

Miles W, are you suggesting that you would have gone with the Large if you had it to do over again or does the Medium suit you fine?

Thanks again. Bret

 

Hello,

I'd like to pull the trigger on a Mojo SL. There is no opportunity for a test drive where I live. After entering 'my specs' (Height - 180.8cm or 5'9" feet/inches; Inseam - 81.4cm or 32" inches) into an online sizing tool, I get the following MTB frame recommendation:
- Frame Size Center-to-Center: 17 inch
- Frame Size Center-to-Top: 18 inch

After reviewing the Ibis website and some other web discussions on Ibis sizing, I find myself still wondering if I need a Medium or a Large frame. Any assistance would be greatly appreciated. Cheers.

I'm 5'8" with a 30" inseam with an SL medium. My seat is extended about perfect. If your legs are 2" longer, I would start to think your seat might be extended a bit far for a medium. I would tend towards a large for you.

If you extended your seat 2" on a medium, then you would lean farther down to touch the handle bars and be less upgright. It's a personal thing, but for Me, I like a more upright position because it is both comfortable for longer rides and I seem very stable on descents. If necessary on a few climbs I slide a little forward on the seat. But it's no big deal and worth the trade off for me.

I've ridden on a large frame of my friends (both a mojo and a kona). I think if I was on the boundary between two sizes, I would tend towards the larger size because I always had fun on both of his bikes when I rode them even though they were technically too large.

Also, you can always shorten the stem on the large if your torso is shorter. Steering gets a bit faster, but I think it is fine. I'm running my medium sl with a 90mm stem. it really feels great and I love it. A fried of mine is running either a 70 or 80mm stem on his sl medium for example

 

Hello,

I'd like to pull the trigger on a Mojo SL. There is no opportunity for a test drive where I live. After entering 'my specs' (Height - 180.8cm or 5'9" feet/inches; Inseam - 81.4cm or 32" inches) into an online sizing tool, I get the following MTB frame recommendation:
- Frame Size Center-to-Center: 17 inch
- Frame Size Center-to-Top: 18 inch

After reviewing the Ibis website and some other web discussions on Ibis sizing, I find myself still wondering if I need a Medium or a Large frame. Any assistance would be greatly appreciated. Cheers.

How tall are you? 180.8cm is just over 5'11", not 5'9". Which is it, 5'9" or 5'11"? Might make a big difference as you're right on the edge with sizes.

 

Crap... Thanks mtb143 for catching my error. I'm 5'9". Bret

 

Medium.

 

Bret, Go medium. IMO there is not much you can do if a frame is too big but you can play with things a little if it's marginally small. :thumbsup:

 

Thanks to everyone that provided advice. I'll post again when I get this sorted out. Cheers.

 

If you use (or used) the wrenchscience.com online fitting, they include a total "overall reach" number which you can use to see what length stem you would need for the frame's TT measurement. Might be helpful in your decision.

 

Thanks noshortcuts... good advice.

 

Hi Bret, I am pretty much the same measurements as you and wrote Ibis about the same question. Scot himself (I think?!) replied and said "...definitely recommend a medium..." based on what I informed him about my riding style (most trail riding and singletracks with no all mt) and my measurments (5'9", 32" inseam). He recommends a 110 stem for me, since the head angle is on the slack side, which evens out the weight of the front better.

I think there is an Ibis employee who used to respond here quite a bit about this sizing concern. You may want to search for it in the archives. I'm getting the SL sometime later in the month as well. I ride a medium Intense 5.5 and formerly a medium Stumpy FSR as well. They both are fine with their 23" top tube but I still wonder if a large SL (23.6" top tube) versus a medium SL (22.8" top tube) can be more comfy on climbs....of which I do plenty! Good luck!

 

Thanks onegymrat. I did contact Ibis and they say it is a tough call, given my dimensions, but at the end of the day they're suggesting medium. I'll be going with the medium. Cheers.

 

Sorry to confuse things (maybe) but I'm around 5' 9" with approx a 30-31 inseam and just got a large after trying out the large. I like a short stem for more of an AM feel rather than stretched out XC and the large (all my other bikes are medium) feels great.

 

Medium. The Mojo was built and engineered with a short box, so it feels more compact than some other comparable bikes. I am 5'9" and it works perfect. I also prefer a 90mm stem myself, and I have played with 80, 90, 100 and 110 lengths, but found the 90 was a good compromise. Specialized used to make a framesize that was a medium-large, which I really liked, but I find a large just to big for my tastes, and I happen to like an old school top tube!

 

Medium. The Mojo was built and engineered with a short box, so it feels more compact than some other comparable bikes. I am 5'9" and it works perfect. I also prefer a 90mm stem myself, and I have played with 80, 90, 100 and 110 lengths, but found the 90 was a good compromise. Specialized used to make a framesize that was a medium-large, which I really liked, but I find a large just to big for my tastes, and I happen to like an old school top tube!

Hi gram. Totally agree with you. I'm 5'9" and have a 90mm stem on my medium but can you please enlighten me ...what is an old school top tube ??

 

Really appreciate the input. Still feels a bit like I’m flipping a coin, but I’m going to go with a medium. My bike shop offered to switch to a Large for $100 if things don't work out which I thought that was fair. Cheers.

 

I meant the top tube is a bit more stretched out, newer bikes tend to be a bit more compact in their geometry, which helps in going down, and aids in maneuverability, but being more stretched out helps with climbing, my bike from the 90's has a stretched out geometry, and on top of that we used to use 120-130 stems! It made for some good climbing but it was awfully tough on the back.

 

I'm 5ft 9 with a 30.5 inseam and ride a medium with a 90mm stem. i ride mostly rocky, rooty, trails in the northeast. I'm glad I went with the medium. Oh, and I came off a medium turner 5 spot. They are sized pretty damn close as I matched them against each other.

 

I am 180 (5 11) and have a large. It is not the fastest around tight corners, but bombs on any fast tech stuff. I run a 100mm stem and saddle a fraction lower than ideal for a hardtail. I think large would be too big for you some of the time and may feel sluggish and clumsy.

 

5' 11", 32 inseam, ride a medium. 90mm stem, approx. 1" setback on the Maverick Speedball seatpost. Couldn't imagine a better fitting bike. Tried both a Large and a Medium.

 

Excellent support. I ordered a Medium X9 build last night. Thanks everyone. See you out on the trails. Cheers. Bret

 

Follow-up Post Ride Report - I've been on the Mojo SL for 10 days. Medium is a great fit with a 90mm Ibis stem with Easton Monkey Lite Bar (medium rise). Test rides have included a 3hr road ride as well as many 1-2.5 hour trail rides. Most fun bike I have owned so far.
Previous:
Rocky Mtn Element Race
Psycle Werks Wild Hare
Kona Explosif
Norco Nitro
Litespeed Obed
Litespeed Unicoi
Rocky Mountain Hammer

 

Kinda small here guys 5'2"...aiming for Mojo SL small size.. any inputs?

 

The problem with all of this talk of virtual top tube is that 1) that measurement is really meaningless and 2) most of the measurments on bicycles manufacturer websites are meaningless if they do not include the axle to crown measurement that the listed measurements are based upon. Ibis does not mention this. Since I assume the Mojo is for a 140mm fork, I assumed a 510-515 axle to crown. But the reason I feel the virtual top tube is pointless is that most people use the saddle position and setback/regular seat post to position themselves in a specific position fore/aft relative to the pedals (and therefore bottom bracket). So the real measurment that is needed if you are to compare apples to apples is something the Turner bikes website calls REACH. This is the horizontal distance between the bottom bracket shell and the head tube.

For example, for a Turner Flux it is specified with a 490mm axle to crown (120mm fork). The REACH is 16.6" and the Virtual TT is 23.3". If a 470mm axle to crown fork is then installed (100mm fork) then REACH is actually extended to 17.0" but the virtual top tube is shortened by 0.1". So if you based everything off of Virtual Top Tube measurments but always set your fore/aft position by (for example) putting your knee exactly over the pedal spindle, then you would think the feel of the reach to the bar would not be changed but in fact it would extend by 0.4" which is approximately equivalent to a 10mm stem size change.

I currently have an 18" El Saltamontes that has a similar virtual top tube to a friends Turner Flux. We both felt that my reach felt way shorter than his. We found this odd since the virtual TT on mine was only 0.3" shorter (but I had a 10mm longer stem). So we thought they should feel almost the same. However his REACH measurement (with a 100mm fork) is 17" and mine is 15.9". I like the feel of his bike better and I am trying to replicate this on an Ibis Mojo. If I assume a 510mm axle to crown on the Ibis measurements, then I calculate the REACH to be 16.5" for a large. So even though I am only 5' 10" and mostly ride XC, I am considering goin with a large frame.