Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Lookin for a Chainring

Old 07-09-13, 09:10 AM
  #1  
mattgmann
Senior Member
Thread Starter
 
Join Date: Feb 2013
Location: OH IO
Posts: 188
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Lookin for a Chainring

I recently upgraded the drivetrain on my mtb commuter to 10sp SLX. I ended up with a 24-32-42 triple crankset (because it was on sale for $89), and 11-34 cassette in the rear.

The 42 tooth big ring just isn't enough for the road. I'm having trouble finding a 10sp 48t or 46t chainring. Could someone please point me in the right direction?

Thanks
mattgmann is offline  
Old 07-09-13, 09:35 AM
  #2  
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 35,968

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 122 Post(s)
Tagged: 1 Thread(s)
Quoted: 4342 Post(s)
Likes: 0
Liked 1 Time in 1 Post
I assume you have a 110bcd bolt circle, so look for a "compact drive" 10s ring (except Campagnolo). I'm fairly sure Sram offers one, but if you cannot find one, odds are a 9s will work as well.

However you may see some loss in shift crispness shifting from a 32 to 46 ring. It shouldn't be worse by enough to be a deal breaker, just letting you know so you're not surprised.

BTW- 42/11 isn't so terribly low for a high gear on a road bike. It's much higher than what most experienced riders use at speed up to 20mph or more under power. Yes, you might like something higher for tailwinds and shallow downgrades, but with a bit of improvement in your cadence the 42/11 should be plenty adequate for most conditions.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 07-09-13, 09:48 AM
  #3  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 41,398

Bikes: 8

Mentioned: 188 Post(s)
Tagged: 0 Thread(s)
Quoted: 6839 Post(s)
Likes: 0
Liked 217 Times in 180 Posts
supposing 32 is the middle, then the 110bcd is not possible. But the Idea is the Same.
need to know the Bolt circle .. measure to learn that..
44:11 is 4:1 so same as a 13:52,
For no small number of racers that was plenty to win big tours..
fietsbob is online now  
Old 07-09-13, 02:09 PM
  #4  
sreten
Banned.
 
Join Date: Feb 2013
Location: Brighton UK
Posts: 1,662

Bikes: 20" Folder, Road Bike

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Hi,

42 with 11 is a little higher than my top 52 with 14.
My wheels may be a little bigger overall than a MTB.

It is plenty high enough for a commuter unless you
are a speed demon or basically mash too much.

the 52 with 14 ends up about 100 gear inches on
my road bike and TBH I hardly ever use it, along
with the 52 and 16, 52 and 18/20/22 mostly.

My folder with 48 and 14 and 20" wheels pans out
at 66 gear inches, to go fast I need to spin, and
most people will go faster spinning than mashing.

I can do up to 20mph on the folder, at that sort of
pedalling cadence on the road bike in top would be
30mph - but I cannot produce that sort of power.

I cannot see how your gearing is too low for a commuter.

rgds, sreten.

I also can't see the point of a megarange rear cassette
on a bike with with 3 front chainrings. 11 to 34, a 3:1
range is lots bigger than the 14 to 28 (2:1) is I use on
my double road bike (52 and 42) and single (48) folder.

3 on the front you want a close ratio rear cassette.

Last edited by sreten; 07-09-13 at 02:22 PM.
sreten is offline  
Old 07-09-13, 04:38 PM
  #5  
cyccommute 
Mad bike riding scientist
 
cyccommute's Avatar
 
Join Date: Nov 2004
Location: Denver, CO
Posts: 21,258

Bikes: Some silver ones, a red one, an orange one and a few titanium ones

Mentioned: 92 Post(s)
Tagged: 1 Thread(s)
Quoted: 2473 Post(s)
Likes: 0
Liked 104 Times in 71 Posts
Originally Posted by mattgmann View Post
I recently upgraded the drivetrain on my mtb commuter to 10sp SLX. I ended up with a 24-32-42 triple crankset (because it was on sale for $89), and 11-34 cassette in the rear.

The 42 tooth big ring just isn't enough for the road. I'm having trouble finding a 10sp 48t or 46t chainring. Could someone please point me in the right direction?

Thanks
If your crank is a Shimano SLX, it is a 104/64mm BCD crank. This tech document for the FC-M660 (last year's model) says that the ring is interchangeable with a Shimano FC-M770 which is the 9 speed XT crank. You never know what Shimano is up to these days, but it might be worth a shot to try a 9 speed ring.

On the other hand, Bikesonline lists an FSA 48 tooth 10 speed outer ring here.
__________________
Stuart Black
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!
Days of Wineless Roads. Bed and Breakfasting along the KATY
Twisting Down the Alley. Misadventures in tornado alley.
An Good Ol' Fashion Appalachian Butt Whoopin'.
cyccommute is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
mapeiboy
Fifty Plus (50+)
12
07-25-13 11:39 AM
giskard
Bicycle Mechanics
11
09-05-12 04:31 PM
Yangster
Road Cycling
2
07-18-10 11:38 AM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.