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Cassette sizing

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Old 10-09-11, 11:46 PM
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fishymamba
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Cassette sizing

Hello guys! I am planning on changing cassettes and I have a question. My current is a Sram 9 speed 12-26. If I swap out this one for a 11-36 cassette will I have to change anything else on the bike? Will I need to retune the rear derailleur. What if I switch to a 11-28? Will it require different tuning? I plan to use an old cassette/wheelset for commuting and casual riding and a new wheelset/cassette for long and/or fast rides and I do not want to retune whenever I switch wheels. Thanks!
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Old 10-10-11, 12:05 AM
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Answer depends on a couple factors. 26 to 36 tooth is a big jump. If you have a road rear derailuer the max is typically 28ish. The other concern is something called chain wrap This is the chain slack the derailuer can accommodate between the fewest tooth gear combo and largest tooth gear combo. I would suggest finding the shimano techdoc equivalent and see what the max cog size is and chain wrap for your brand of rear derailuer.

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Old 10-10-11, 12:06 PM
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New chain , & Need an MTB long cage rear derailleur too..

Given: the chain and cogs wear , you will take the chain
off the bike when you pull off the wheel..

Why not leave the new stuff on.. ?

Last edited by fietsbob; 10-10-11 at 12:11 PM.
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Old 10-10-11, 04:09 PM
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fishymamba
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Originally Posted by fietsbob View Post
New chain , & Need an MTB long cage rear derailleur too..

Given: the chain and cogs wear , you will take the chain
off the bike when you pull off the wheel..

Why not leave the new stuff on.. ?
I want to change to the new wheels when I go on rides and use my old wheels when I go on commutes or short ride(the bike stays outside for a long time and I don't want the wheels damaged or stolen), and I don't want to change cassettes every time.

If I go to a 11-28 would it be fine?

Currently I am using a Tiagra long cage rear derailleur with a triple up front.
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Old 10-10-11, 06:22 PM
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Al1943
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Originally Posted by fishymamba View Post
I want to change to the new wheels when I go on rides and use my old wheels when I go on commutes or short ride(the bike stays outside for a long time and I don't want the wheels damaged or stolen), and I don't want to change cassettes every time.

If I go to a 11-28 would it be fine? Currently I am using a Tiagra long cage rear derailleur with a triple up front.
Yes, if 9-speed.
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