B
Ben Micklem
Guest
Hi,
I've been following the discussion on wheel ejection for a while.
I have just specified to a frame builder my new frame and fork. This will be
a touring/cyclocross/commuter 700c bike with disc brakes. The frame will be
lugged Reynolds 631 and 725 steel, the fork will have a cast crown and
curved blades made from Tandem-spec tubes. The fork drop-outs will be
straight (i.e. in line with the fork blade at its tip)- so they will be at
an angle of approximately 20 degrees from vertical, facing slightly towards
the front. These are used on tourers to allow easy wheel removal when using
close-fitting mudguards/fenders. The drop-out is designed for road bikes, so
has no lawyer lips.
When I suggested fitting the calliper IS mount on the front of the right
fork, they said it would be very unwise to do this- due to the tensile
forces exerted. I think the mount would be brazed on using sliver, as that
is what the rest of the frame is brazed with- so I guess would not be as
strong as a tig welded mount (as I guess the Cotic Roadrat's fork is?). At a
guess, from the touring forks with disc mounts I saw at their shop, the
calliper would be at around the 2 o'clock to 3 o'clock position. 160mm rotor
and Avid BB7 mechanical road callipers would be used.
Would people be worried about this configuration? Would a silver brazed
mount be strong enough to be mounted on the front of the right fork blade?
They said they have 20 years experience of disc mounts on their custom
forks, and have not heard any problems with ejections.
Ben
I've been following the discussion on wheel ejection for a while.
I have just specified to a frame builder my new frame and fork. This will be
a touring/cyclocross/commuter 700c bike with disc brakes. The frame will be
lugged Reynolds 631 and 725 steel, the fork will have a cast crown and
curved blades made from Tandem-spec tubes. The fork drop-outs will be
straight (i.e. in line with the fork blade at its tip)- so they will be at
an angle of approximately 20 degrees from vertical, facing slightly towards
the front. These are used on tourers to allow easy wheel removal when using
close-fitting mudguards/fenders. The drop-out is designed for road bikes, so
has no lawyer lips.
When I suggested fitting the calliper IS mount on the front of the right
fork, they said it would be very unwise to do this- due to the tensile
forces exerted. I think the mount would be brazed on using sliver, as that
is what the rest of the frame is brazed with- so I guess would not be as
strong as a tig welded mount (as I guess the Cotic Roadrat's fork is?). At a
guess, from the touring forks with disc mounts I saw at their shop, the
calliper would be at around the 2 o'clock to 3 o'clock position. 160mm rotor
and Avid BB7 mechanical road callipers would be used.
Would people be worried about this configuration? Would a silver brazed
mount be strong enough to be mounted on the front of the right fork blade?
They said they have 20 years experience of disc mounts on their custom
forks, and have not heard any problems with ejections.
Ben