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From tripple chain ring to a double chain ring.(4 posts)

From tripple chain ring to a double chain ring.mtbcyclist
Jan 22, 2004 9:51 AM
Just upgraded my entire bike. Got a Litespeed Hperion w/ ultegra on sale. Only catch is it is a double and my old bike is a tripple. Not big deal 90% of the time becasue Raleigh NC and sorrounding areas do not warrant the use of a tripple.

The issue comes when I want to do the Bridge To Bridge century and other long rides in the mountians.

What do yo all recomend and/or do? A buddy of mine just swaps out for n Shimano XT cog set on the rear end for mountian rides if he feels he needs it.
re: From tripple chain ring to a double chain ring.Rusty Coggs
Jan 22, 2004 10:35 AM
Your bud has the cheap answer.You probably also need the mtb RD to shift a cog bigger than a 30..Your ultegra is speced for a 27,will usually handle a 30.The B tension may need some fiddling, and pay attention to chain length.
Cheaper still if you already have a 12-25outofthesaddle
Jan 23, 2004 10:30 AM
Go to Performance buy a house brand Shimano compatible mt. cassette (I got one for $10). Remove the 28 cog from the Performance cassette. (Disassemble the by removing the 3 small studs.) Remove the 13 cog from your current road cassette (you need the keep the 12) and place the 28 cog behind the final cluster of your 12-25. Worked for me and cheaper than getting a new 27 just for a few events.
OrChen2
Jan 23, 2004 1:24 PM
Buy a 13 with built-in spacer and a 28 (or 29) from www.sheldonbrown.com Harris Cyclery. Remove the 12 and 13, put on the new 13 with built-in spacer, add the 28 on the back (assuming you start with a 12-25). Or build a 14-28 with a 16 in the middle.