Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Mountain Biking Mountain biking is one of the fastest growing sports in the world. Check out this forum to discuss the latest tips, tricks, gear and equipment in the world of mountain biking.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 05-31-14, 10:09 AM   #1
replica9000
Newbie
Thread Starter
 
Join Date: May 2014
Location: Quahog, RI
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Suntour XCC-T102 to Shimano FC-M311 swap.

I have a new GT Aggressor 1.0. From what I can find, it comes with the SR Suntour XCC-T102 42/34/24T crank. I was interested in upgrading to a 48/38/28T crank. I see the GT Tachyon 2.0 comes with the Shimano FC-M311 48/38/28T crank. Would this be a simple swap?
replica9000 is offline   Reply With Quote
Old 06-01-14, 09:26 PM   #2
eicca
Professional Noob
 
eicca's Avatar
 
Join Date: Aug 2011
Location: Utah County, UT
Bikes: Frankenbike III (Cannondale Jekyll Carbon Team)
Posts: 110
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I swapped a Suntour for a Shimano. I'd highly recommend swapping the bottom bracket too so the Shimano fits right (speaking from experience). Very easy job, I bought the tools and did it myself. It cost the same for the tools as it would have for the shop to do it. Just remember: the threads on the bottom bracket are reversed on the chain side (speaking from experience again )
eicca is offline   Reply With Quote
Old 06-03-14, 07:37 AM   #3
replica9000
Newbie
Thread Starter
 
Join Date: May 2014
Location: Quahog, RI
Bikes:
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for the reply. How do I know what bottom bracket I'll need? Most of the cranks I've looked at are listed "Compatible bottom bracket: Square type" or "Spindle Interface Type: Square Taper JIS". I'm not seeing anything more specific than that.
replica9000 is offline   Reply With Quote
Old 06-03-14, 06:59 PM   #4
eicca
Professional Noob
 
eicca's Avatar
 
Join Date: Aug 2011
Location: Utah County, UT
Bikes: Frankenbike III (Cannondale Jekyll Carbon Team)
Posts: 110
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Square taper is a pretty common type of bottom bracket. There are a few different types of square tapers within that class, all using different lengths and stuff (such as Japanese International Standard, or JIS). If you pair the Shimano crankset with the Shimano bottom bracket it specifies in the crankset instructions, you'll have no issue. As long as you get the size right. The axle and body lengths are variable. A local bike shop should measure it for you for free and tell you what size you need.
eicca is offline   Reply With Quote
Old 06-03-14, 07:02 PM   #5
hybridbkrdr
we be rollin'
 
hybridbkrdr's Avatar
 
Join Date: Oct 2009
Location: Quebec, Canada
Bikes:
Posts: 1,570
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
That's a good question. The way the Shimano Technical Documents are made, you can't always align the model number of the crank to the length of the bottom bracket recommended. It depends on the model but what I do is search and look at a number of sites to try to confirm what I've found.
hybridbkrdr is offline   Reply With Quote
Old 06-05-14, 04:46 PM   #6
Gnosis
Senior Member
 
Join Date: Mar 2012
Location: southeastern PA - a mile west of Philadelphia
Bikes:
Posts: 430
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Shimano’s FC-M311 48/38/28 crankset requires a BB-UN26 (-K) square taper bottom bracket which has a spindle length of 123mm. The crankset’s offered in 170mm & 175mm crank arm lengths.
Gnosis is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -6. The time now is 07:49 AM.