Two Cx bikes need lower gearing (Shimano 10sp)
01-26-15, 10:55 AM
#1
Senior Member
Thread Starter
Join Date: Dec 2005
Posts: 198
Bikes: Pedal Force RS, Serotta "Atlanta", Gitane "Tour de France", (2) Specialized "Stumpjumper", Trek "950"
Likes: 0
Liked 1 Time
in
1 Post
Two Cx bikes need lower gearing (Shimano 10sp)
I'm currently working on two different 10-sp cx bikes which need lower gearing. I'd like some input on my choices and options, please. Both bikes are "gravel bikes" used on paved, gravel and rough rock roads with steep climbs. Both are over-geared on the climbs. Whatever I end up doing, it needs to work reliably.
Current setup:
Chainwheel: 46x34T
Cassette: 28-11T
Rear Derailleur: Shimano 105 (approx. 2.3" pulley C-C) and Shimano Ultegra (approx. 2.1" pulley C-C)
Lever: Shimano 105 and Shimano Ultegra
New Parts:
Cassette: Shimano XT CS-M771 11-32 or, perhaps, 11-34
Rear Derailleur: Shimano XT M772 (Med Cage)
Chains: Shimano Ultegra 10-sp
Is this certain to work well assuming proper installation? Is there another route I should consider? I originally selected a XT-M786 rear derailleur but found a thread which states that I need a 9speed derailleur. I'm not sure how to get the specs to confirm one way or another.
Current setup:
Chainwheel: 46x34T
Cassette: 28-11T
Rear Derailleur: Shimano 105 (approx. 2.3" pulley C-C) and Shimano Ultegra (approx. 2.1" pulley C-C)
Lever: Shimano 105 and Shimano Ultegra
New Parts:
Cassette: Shimano XT CS-M771 11-32 or, perhaps, 11-34
Rear Derailleur: Shimano XT M772 (Med Cage)
Chains: Shimano Ultegra 10-sp
Is this certain to work well assuming proper installation? Is there another route I should consider? I originally selected a XT-M786 rear derailleur but found a thread which states that I need a 9speed derailleur. I'm not sure how to get the specs to confirm one way or another.
01-26-15, 11:18 AM
#2
Mad bike riding scientist
Join Date: Nov 2004
Location: Denver, CO
Posts: 27,713
Bikes: Some silver ones, a red one, a black and orange one, and a few titanium ones
Liked 4,561 Times
in
2,530 Posts
I'm currently working on two different 10-sp cx bikes which need lower gearing. I'd like some input on my choices and options, please. Both bikes are "gravel bikes" used on paved, gravel and rough rock roads with steep climbs. Both are over-geared on the climbs. Whatever I end up doing, it needs to work reliably.
Current setup:
Chainwheel: 46x34T
Cassette: 28-11T
Rear Derailleur: Shimano 105 (approx. 2.3" pulley C-C) and Shimano Ultegra (approx. 2.1" pulley C-C)
Lever: Shimano 105 and Shimano Ultegra
New Parts:
Cassette: Shimano XT CS-M771 11-32 or, perhaps, 11-34
Rear Derailleur: Shimano XT M772 (Med Cage)
Chains: Shimano Ultegra 10-sp
Is this certain to work well assuming proper installation? Is there another route I should consider? I originally selected a XT-M786 rear derailleur but found a thread which states that I need a 9speed derailleur. I'm not sure how to get the specs to confirm one way or another.
Current setup:
Chainwheel: 46x34T
Cassette: 28-11T
Rear Derailleur: Shimano 105 (approx. 2.3" pulley C-C) and Shimano Ultegra (approx. 2.1" pulley C-C)
Lever: Shimano 105 and Shimano Ultegra
New Parts:
Cassette: Shimano XT CS-M771 11-32 or, perhaps, 11-34
Rear Derailleur: Shimano XT M772 (Med Cage)
Chains: Shimano Ultegra 10-sp
Is this certain to work well assuming proper installation? Is there another route I should consider? I originally selected a XT-M786 rear derailleur but found a thread which states that I need a 9speed derailleur. I'm not sure how to get the specs to confirm one way or another.
__________________
Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
01-26-15, 11:32 AM
#3
Senior Member
Depending on what 105 RD you have, it could go up to 32. The RD-5701 with the longer cage is approved to 32T with a double crank up front. It could probably be pushed to 34.
The big issue I see with your setup is that you're going to be using 10 speed shifters with a 9 speed derailleur. That may just not work. Everyone I know who mixes road brifters with mountain derailleurs are using 9-speed brifters, with a 9 speed mountain derailleur and cassette.
The big issue I see with your setup is that you're going to be using 10 speed shifters with a 9 speed derailleur. That may just not work. Everyone I know who mixes road brifters with mountain derailleurs are using 9-speed brifters, with a 9 speed mountain derailleur and cassette.
01-26-15, 12:17 PM
#4
Banned
Your 10 speed shifters will work fine with the 9 speed RD. I prefer the older style ones that have a barrel adjuster. The T661 is nice. Avoid any that say Shadow or low- normal, IMO.
01-26-15, 01:37 PM
#6
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Likes: 0
Liked 1,102 Times
in
747 Posts
The big issue I see with your setup is that you're going to be using 10 speed shifters with a 9 speed derailleur. That may just not work. Everyone I know who mixes road brifters with mountain derailleurs are using 9-speed brifters, with a 9 speed mountain derailleur and cassette.
01-26-15, 01:40 PM
#7
Senior Member
Good to know. I couldn't think of any real good reason it shouldn't work, but I've had issues mixing and matching components before. It only takes a minor mismatch for your shifting to be a pain-in-the-butt after all.
01-26-15, 01:49 PM
#8
Licensed Bike Geek
It's been well documented and discussed in multiple cycling forums about the successful use of Shimano 9-speed MTB rear derailleurs with Shimano 10-speed shifters.
As for personal experience; I've set up my wife's road bike exactly that way: Shimano 6603 triple shifters/crank/front derailleur and Shimamo XT 9-speed rear derailleur and an 11-34 cassette. It's worked perfectly for over 10,000 miles.
As for personal experience; I've set up my wife's road bike exactly that way: Shimano 6603 triple shifters/crank/front derailleur and Shimamo XT 9-speed rear derailleur and an 11-34 cassette. It's worked perfectly for over 10,000 miles.
01-26-15, 08:07 PM
#9
Senior Member
Join Date: Jul 2013
Location: Somewhere in TX
Posts: 2,266
Bikes: BH, Cervelo, Cube, Canyon
Likes: 0
Liked 6 Times
in
6 Posts
You can use this power calculator along with Sheldon's gear calculator to estimate if you're going to need a 32 or 34 rear sprocket. The difference between 28 to 32 is double the difference of 32 to 34.
01-27-15, 07:32 PM
#10
Senior Member
Thread
Thread Starter
Forum
Replies
Last Post
Ozan Guner
Cyclocross and Gravelbiking (Recreational)
16
04-07-13 02:18 PM
