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PostPosted: Sun Sep 28, 2008 3:37 pm 
Retro Guru

Joined: Thu Oct 27, 2005 7:05 pm
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Location: scotland
has anybody run 26" wheels in 29er frame? Any issues/comments/feedback welcome.

(As to why: I have the chance for a 29er single speed frame but only have 26 wheels spare at the moment. Will be using disc brakes)


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PostPosted: Sun Sep 28, 2008 3:53 pm 
Retro Guru

Joined: Wed Mar 07, 2007 10:08 pm
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Location: Newbury, Berks
Don't see why you couldn't as you are using discs. Although it would steepen the geometry and make it really twitchy and it would lower the BB and you might have trouble with crank clearance, unless you have short cranks and the legs of Chris Hoy.


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PostPosted: Sun Sep 28, 2008 4:00 pm 
Retro Guru

Joined: Mon Aug 21, 2006 12:10 pm
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Location: High Peak
icantthinkofausername wrote:
it would steepen the geometry and make it really twitchy


It wouldn't alter the geometry as the wheel contact points and the relationship to the dropouts are identical if both wheels are the same size - just a bit lower to the ground.

As you say, the BB will be lower so there'll be clearance issues, plus it's possible that you might have tyre clearance problems if the chainstays/seatstays are shaped around the tyre.


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PostPosted: Sun Sep 28, 2008 4:21 pm 
Retro Guru

Joined: Wed Mar 07, 2007 10:08 pm
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Location: Newbury, Berks
Dave_H wrote:
icantthinkofausername wrote:
it would steepen the geometry and make it really twitchy


It wouldn't alter the geometry as the wheel contact points and the relationship to the dropouts are identical if both wheels are the same size - just a bit lower to the ground.

As you say, the BB will be lower so there'll be clearance issues, plus it's possible that you might have tyre clearance problems if the chainstays/seatstays are shaped around the tyre.


Good point! Only changing the front wheel would screw it up.

Surely it shouldn't make a difference for the rear tyre, The frame needs to go from the 68/73 BB shell into the 135 rear spacing. So even if the chainstays were kicked in there would still be enough clearance as a 29" tyre fitted in the frame. So if anything wouldn't you be able to fit wider tyres??


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PostPosted: Sun Sep 28, 2008 4:55 pm 
retrobike rider
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Joined: Sun Sep 23, 2007 11:22 pm
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Location: Hove
It is in fact the geometry that's the problem - most 29ers are built with very steep head angles to compensate for the larger wheels, which deaden the steering. So even though the head angle will remain the same after fitting smaller wheels, it's a head angle that is too steep for 26 wheels.

The other effect of course would be to lower the bottom bracket height, possibly making it too low.


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PostPosted: Sun Sep 28, 2008 5:08 pm 
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
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Location: Yorkshire, England
Well the angle from the bottom of the head race to the contact point will change so the pivoting angle will be different and effect the handling in one way or another, but who cares if it's only temporary.


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PostPosted: Sun Sep 28, 2008 8:03 pm 
Mr Darcy
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Location: Bicester
raise it here no problem :wink:


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PostPosted: Sun Sep 28, 2008 8:09 pm 
Retro Guru

Joined: Thu Oct 27, 2005 7:05 pm
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Location: scotland
gump wrote:
raise it here no problem :wink:


Oh heck, where was I originally ?:oops:


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