My roommates rebuilding a bike with 27 1 1/4 wheels, but we're having a tough time finding a rear replacement. Is there some un-written holy law that says he can't put 700s on?
lantius
Posted: Fri Jul 13, 2007 10:26 am
1337Joined: 22 Jul 2005Posts: 6705Location: right over
27" wheels = 630mm effective rim diameter.
700c = 622mm effective rim diameter.
so you basically just need to ensure that there's four more millimeters of reach left in the brakes, otherwise you're set.
zuvembi
Posted: Fri Jul 13, 2007 12:03 pm
Joined: 24 Jul 2005Posts: 942Location: Little Addis Ababa
What are you looking for in a 27" wheel? i.e. steel/aluminum, freewheel, freehub?
Also, Lee is correct. You might already have sufficient brake reach to just drop a 700c wheel in. Or you might not. Then it's time to start looking at drop-bolts, a longer reach brake, or drum/disc brakes.
_________________ When the revolution comes, we're going to need a longer wall
joeball
Posted: Fri Jul 13, 2007 2:33 pm
Joined: 24 Jul 2005Posts: 6037Location: Ether
lantius wrote:
27" wheels = 630mm effective rim diameter.
700c = 622mm effective rim diameter.
so you basically just need to ensure that there's four more millimeters of reach left in the brakes, otherwise you're set.
Lee gave you the Bead Seat Diameter (BSD) dimensions. Effective Rim Diameter (ERD) is different, it is used for calculating spoke lenghths, a deeper dish wheel will have a smaller ERD. Thus, two rims may have the the same BSD but different ERD.
lantius
Posted: Fri Jul 13, 2007 2:46 pm
1337Joined: 22 Jul 2005Posts: 6705Location: right over
andre's right, i had erd on the brain this morning, crunching spoke lengths for my new rear wheel and my sturmey archer dynohub, woo woo.
henry
Posted: Fri Jul 13, 2007 3:43 pm
somewhat piggishJoined: 05 Aug 2005Posts: 5415Location: on porch with shotgun
lantius wrote:
andre's right, i had erd on the brain this morning, crunching spoke lengths for my new rear wheel and my sturmey archer dynohub, woo woo.
I heard lights on your bike make you more likely to get hit by cars.
All times are GMT - 8 Hours
The time now is Fri Aug 11, 2023 6:10 pm
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
1337
Joined: 22 Jul 2005
Posts: 6705
Location: right over
Joined: 24 Jul 2005
Posts: 942
Location: Little Addis Ababa
Joined: 24 Jul 2005
Posts: 6037
Location: Ether
