Triple chainrings
05-07-12 | 12:04 PM
#51
Tandem Mountain Climber
Joined: Mar 2007
Posts: 4,104
Likes: 3
From: San Mateo, CA
Bikes: Calfee Tandem, Litespeed Gravel, SuperSix Evo HM, Larry vs. Harry Bullitt (e-cargo)
Yeah, but a half-season for a your inner ring is like several lifetimes for other grannies. If I was to be reincarnated as an inner ring, I'd be horrified 
if destined for your Tetra!
Thanks for the tip on the Salsa 28t. We've not had any problems with our TA 30t, but maybe things are different with a 28t. That is throttled.
I'd like to have a 28t inner ring, but it is shifting very well now, and I think this would necessitate switching from a 42t to 39t middle, and I fret that this would degrade the middle to outer (53t) shifting. I'll let you go first!
if destined for your Tetra!Thanks for the tip on the Salsa 28t. We've not had any problems with our TA 30t, but maybe things are different with a 28t. That is throttled.
I'd like to have a 28t inner ring, but it is shifting very well now, and I think this would necessitate switching from a 42t to 39t middle, and I fret that this would degrade the middle to outer (53t) shifting. I'll let you go first!
Another concern with the 28 is that it may rub the bottom of the FD cage, where the front plate joins the rear plate, when you move down the cassette. This may limit your cross-chaining ability before the chain length does.
05-07-12 | 07:43 PM
#52
Tandem Mountain Climber
Joined: Mar 2007
Posts: 4,104
Likes: 3
From: San Mateo, CA
Bikes: Calfee Tandem, Litespeed Gravel, SuperSix Evo HM, Larry vs. Harry Bullitt (e-cargo)
I installed them just now and took a spin around the block.
53t Dura Ace 7800 outer
39t FSA triple middle
28t Salsa inner
Shifts are perfect, especially the 39t -> 53t shift.
Actually with the 6700 FD, the inner cage is shaped for a 39t middle. With the 42t middle, I always ran it in a higher position than would be ideal to avoid the inner cage rubbing on the middle ring while the chain was on the big ring. So far the 39->53 shift (with the better positioned FD) seems better than the 42->53 was.
53t Dura Ace 7800 outer
39t FSA triple middle
28t Salsa inner
Shifts are perfect, especially the 39t -> 53t shift.
Actually with the 6700 FD, the inner cage is shaped for a 39t middle. With the 42t middle, I always ran it in a higher position than would be ideal to avoid the inner cage rubbing on the middle ring while the chain was on the big ring. So far the 39->53 shift (with the better positioned FD) seems better than the 42->53 was.
05-07-12 | 08:49 PM
#53
Thread Starter
Tandem Vincitur
Joined: Sep 2005
Posts: 3,317
Likes: 2
From: Northern California
Bikes: BMC Pro Machine SLC01, Specialized Globe, Burley Rock 'N Roll tandem, Calfee Dragonfly tandem.
So, 6700 is Ultegra. The FD-6700 is the double, and the FD-6703 is the triple FD. Do you have the FD-6703?
I wasn't really sure what I had, until creeped about and snagged a photo. Its a discontinued FD-7703, for 9-speed.
I wasn't really sure what I had, until creeped about and snagged a photo. Its a discontinued FD-7703, for 9-speed.
Thread
Thread Starter
Forum
Replies
Last Post
Brewsmith
Classic and Vintage Sales
2
07-11-18 02:05 PM
