Get In Where You Fit In

There are plenty of wheel and tire size options out there for mountain bikers. It can be a little confusing so here are some facts and figures to help you hit the trail with ease.

Tire/Geometry Modifications

With the different demands of riders around the globe, we’re aware that there are a variety of conditions, terrains, and wheel/tire combinations out there. For example, our 29/6Fattie trail chassis are designed to be compatible with both 29" and 650b x 3.0" tires, but the switch will alter the fit and ride of the bike in different ways. We want you to know how a change like this will differentiate your ride and if it's the best idea for you.

Depending on where you are in the world, some bikes might arrive with different tires. This isn't because they won’t fit, but because some fit better than others, while we also have to adhere to local regulations around the globe. Below are some guidelines on what is a rideable clearance on our frames, as well as what should never be attempted, for both the safety of you and your bike.

Setup: 29/6Fattie trail chassis, 150mm travel fork, 110/148mm frame/fork spacing
 
29x2.3
650x3.0
650x2.8
650x2.6
650x2.3
TIRE OUTER DIAMETER (OD)
743mm
730mm
718mm
717mm
705mm
BB HEIGHT
338.5mm
332mm
326mm
325.5mm
319.5mm
BB DELTA
-
-6.5mm
-12.5mm
-13mm
-19mm
CHAINSTAY CLEARANCE
10+mm
7mm
10mm
10mm
10+mm
PASS ISO?
Yes
Yes
Yes
Yes
Yes
IS THIS AN ACCEPTABLE RIDER GEOMETRY?
Yes
Yes
Rider's call;
BB is low
Rider's call;
BB is low
Rider's call;
BB is mega low

Wheel/Tire Clearance Guide

It’s hard to cover every one of the possible changes, so the chart below gives you some guidelines for the wheel/tire combinations that we make and lets you know whether or not you can, or should, be trying out a new setup. The Red/Yellow/Green colors will guide you through the chart, just like an American stoplight, where Green means go, Yellow means proceed with caution, and Red means stop.

Setup: 29/6Fattie and 650b trail chassis, 150mm travel fork, 110/148mm frame/fork spacing
 
29x2.3
650x3.0
650x2.8
650x2.6
650x2.3
29/6FATTIE FRAME
green-circle 25px
green-circle 25px
yellow-triangle 25px
yellow-triangle 25px
red-x 25px
650b FRAME
red-x 25px
red-x 25px
yellow-triangle 25px
green-circle 25px-asterisk
green-circle 25px


*2.8 and 2.6 tires will not fit in rear triangle on Stumpjumper 650b size small due to bottom-out clearance.