On 03/01/2017 02:30 PM, Tim Gavin wrote:
27" to 700c only requires 4 mm more brake reach, so your current
centerpulls may have enough adjustment. They should work OK with new
pads and cables.
That also equates to 4 mm more tire clearance.
in height, anyway. There'd be some increase in clearance at the chain
stays due to being farther back from the bottom bracket, but it's well
beyond my ability to guess exactly how much you'd gain that way.
I did a 27" to 700c conversion as part of an overhaul of my
girlfriend's father's 80s Raleigh USA Marathon. It fits a 700 x 32
tire under an SKS P45 fender, although the clearance is pretty tight
under the rear brake bridge. Tektro R539 medium-reach calipers had
the proper reach.
As for the rear hub, you should be able to cram a 126 mm hub in there
without cold-setting the stays. But it will be a challenge each time
you install or remove the rear wheel.
Another option would be a wheel built on a 120mm Grand Bois cassette
hub. Compass sells them, and 6 speed Hyperglide cassettes that in
effect are "six of seven on five."
Some folks have luck re-spacing hubs by adjusting and/or removing
spacers on the axle, and then re-dishing the rim. You may be able to
remove a 5 mm spacer on the non-drive side of the axle.
On Wed, Mar 1, 2017 at 12:30 PM, Wayne Naha <w.r.n...@gmail.com
<mailto:w.r.n...@gmail.com>> wrote:
I would like to keep this conversion as simple as possible, so
changing out the BB is not a priority. A five speed freewheel
plus a triple chainring crank is plenty enough for me. The
existing brakes are CP, though I was thinking of replacing them
with the longer reach Silver side pulls. I don't think the
current CP brakes have sufficient reach. The brake levers are
original, and leave much to be desired. And while the current
headset is not showing any signs of a problem, I do have an
Ultegra headset not doing anything in my parts bin. I may as well
throw it on.
On Wednesday, March 1, 2017 at 1:09:24 PM UTC-5, George Schick wrote:
If the hub/FW is a five speed that would mean 120mm spacing.
There should be no need to cold set anything if you can find a
120mm hub. Check eBay for NOS. If you want to bump it up to a
6 or 7 speed then you'll need to widen the rear spacing a bit
(to 126mm) by cold spacing (see Sheldon for details on that)
for smooth installation and removal of the wheel. 'Course,
that'll also mean a new FW /and/ you may have to change the BB
cartridge again to get it properly aligned with the wider
rear. I don't think I'd bother doing that if the existing FW
is still in good shape and just keep it a five-speed. BTW,
what kind of shape is the headset in? You didn't mention that
being replaced in your OP. If the brakes are CP and you want
to change to SP, you'll be removing the brake cable hanger so
it might be a good time to consider a new headset - especially
if the existing is "indexed."
On Wednesday, March 1, 2017 at 11:54:58 AM UTC-6, Wayne Naha
wrote:
I had wanted all sparkly new hubs, along with the new
rims. But the rear spacing issue had slipped my mind.
The freewheel is in decent shape, and it is a five speed,
so that means 120mm spacing? What about 'cold setting'
the rear triangle? Any downside to that?
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