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Discussion Starter · #1 ·
I did some searching but didn't find what I was looking for so here goes...

How is the 'trail' affected when using a 650B wheel with a (made for) 26" fork? Does it make the bike longer or does it affect it at all? (Assuming you are using a frameset built for 650B.)

(This isn't a question about whether 650B is the right way to go or not, this a question coming from someone that is very intrigued by 650B and wants to build a new hardtail as soon as he can make sense of it all! :thumbsup: )
 

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mnt bike laws of physics
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The trail increases whenever you increase the radius of the wheel/tire and also increases when you raise the front end(decrease the Head Angle). So, when you put a 650b wheel in a 26" fork, the trail increases both because of lifting up the front end about 1/2" and by increasing the wheel radius by 1/2".
The lifting part decreases the HA by about 0.6 degrees.
It does not make the bike longer by putting on a larger wheel.

http://www.wisil.recumbents.com/wisil/trail.asp?calculate2=yes#Actual Trail Calculator
is a great trail calculator(the 2nd calculator on the page).
 

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www.derbyrims.com
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A 650b specific fork makes the wheelbase longer, but only by about the 1/4 inch greater offset dimension over a 26'er fork.

Using a 26'er fork with the same a2c, travel, and sag as a 650b fork on the same bike would have about 0.10 inch more trail. That is about the affect of adding about 1/3 degree slacker head angle to steering - you probably wouldn't notice after the first ride, if ever. Steering feel is more about what you are used to. Going to a different bike will have plenty of change to get adjusted to.
 

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Discussion Starter · #6 ·
Rat Pack

I guess that makes this the Rat Pack forum... :thumbsup:

Thanks for the info, I think I've got it covered now - cannot wait to build up a Rat Pack bike!
 
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