Changing to compacts
1- I've seen a shim 105 5750 crank. Will this fit my existing set up?
2- do I need to change the bottom bracket?
Thanks for any feedback in advance!
Replies to This Discussion
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Permalink Reply by Jim Cooper on -
Yep, I pretty much use 50/11 downhill or on very rare tail wind high speed flats. Not used much!
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Permalink Reply by Trent on -
Another question. For exmple is an ultegra cassette compatible with 105 components??
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Permalink Reply by Tim B on -
SRAM do a 12-28 cassette, pretty sure they are compatible and bolt straight on
http://www.sram.com/sram/road/products/sram-pg-1070-cassette#/path/...
Oh, and a 39 x 28 is a 37.6 gear inches, nearly as low as a 34 x 25 which is 36.7
Shimano do a 12-30, but you would need a new rear deraileur for that I believe
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Permalink Reply by Trent on
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12-30 is a bit extreme. 11-28 may just leave a few in the middle missing. SRAM 12-28 may be an option or can get 105 12-27
Too many decisions!!!
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Permalink Reply by Matt Brennan on -
Im pretty sure the cogs in ultegra are
12-13-14-15-16-17-19-21-23-25
11-12-13-14-15-17-19-21-24-28
you only drop the 16 and jump on the granny.
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Permalink Reply by Frank on
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The 24-28 is where the big jump occurs, run compacts and a 11/25 and you be spinning your way up any hills that SA has to offer!
I easily do cork screw seated on that and my legs are by no means power houses!
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Permalink Reply by Trent on
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Thanks frank. I am considering going a 12-27. I can generally get up the hills that are around my area but sometimes just need that bit of relief. The jump from 24-28 does seem significant
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Permalink Reply by Tim B on
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But, you would only use it now and then as a bail out gear presumably, not be shifting in and out of it every ride, essentially a 9 speed cassette plus 1.
Think there are pros and cons for either standards or compacts, at the end of the day it comes down to what you want.
Lord knows how we survived with only 5 speed groups not so long ago! :) -
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Permalink Reply by Jim Cooper on
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The jump from 24 to 28 is a beautiful thing when buzzing up Nettle Hill!
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Permalink Reply by Terry C on
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I use a 13-27 Ultegra, which is also difficult to find, but made one up from two other cassettes. The sprockets can be interchanged, even if you need to use one or two sprockets from say a 105 or a Dura-Ace. All the sprockets from a given speed range, will interchange. eg: a 16T from a 105 will work with an Ultegra cassette, or Dur-Ace, providing they are all from 9 speed or all from 10 speed.
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