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Discussion Starter · #1 ·
Can a wheel set with an 11-32 shimano cassette be switched onto another bike that is currently using DA 9100 rear derailleur with an 11-28? I realize with the 9000 series RD a long cage is required.


I know the new standard size DA 9100 rear derailleur can accommodate an 11-32 cassette b/c I am running that set up on one of my bikes. So I guess I am wondering if the chain length on the 11-28 bike with the 9100 RD can accommodate th 11-32 cassette?
 

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Can a wheel set with an 11-32 shimano cassette be switched onto another bike that is currently using DA 9100 rear derailleur with an 11-28? I realize with the 9000 series RD a long cage is required.


I know the new standard size DA 9100 rear derailleur can accommodate an 11-32 cassette b/c I am running that set up on one of my bikes. So I guess I am wondering if the chain length on the 11-28 bike with the 9100 RD can accommodate th 11-32 cassette?
No...the RD9100 is spec'd for a max cog of 30. It apparently works on your bike, but it won't work on all bikes, that is exactly why Shimano says max cog=30.

There is no RD9000 or any other Shimano road derailleur w/ a 'long' cage. Nor is there any D/A w/ a 'medium' cage. You can get an Ultegra GS (medium) cage derailleur that will work w/ a 32 cog.

As for your chain, if you've got a short (SS) cage derailleur and a 28 chances are very good your chain is going to be too short to add 4 more teeth and a medium (not long) cage derailleur. I've done this conversion dozens of times and I always need to install a new chain.
 

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Discussion Starter · #3 ·
No...the RD9100 is spec'd for a max cog of 30. It apparently works on your bike, but it won't work on all bikes, that is exactly why Shimano says max cog=30.

There is no RD9000 or any other Shimano road derailleur w/ a 'long' cage. Nor is there one w/ a 'medium' cage. You can get an Ultegra GS (medium) cage derailleur that will work w/ a 32 cog.

As for your chain, if you've got a short (SS) cage derailleur and a 28 chances are very good your chain is going to be too short to add 4 more teeth and a medium (not long) cage derailleur. I've done this conversion dozens of times and I always need to install a new chain.
Thank you for the informative response. Yeah. I run an 11-32 with the 9100 RD on my titanium No. 22 Reactor with the rest of the bike DA9000. Haven't had any issues...but sure, the shifts could probably be a bit smoother with an 11-30.

I went with the ultegra 11-32 over the DA 11-30 bc my other bike has an 11-28....and I am used to having the -25 and -28 vs the -27 and -30. I hardly use the -32 but it's nice to have for very specific rides/events with steeper summit finishes.


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The 32 is definitely great when you really need an easier gear, you'll always notice the 32 where you might think the 30 is not quite enough on a lot of climbs.
 

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Discussion Starter · #5 ·
The 32 is definitely great when you really need an easier gear, you'll always notice the 32 where you might think the 30 is not quite enough on a lot of climbs.
Agreed. If i am cooked and mashing in the -28, don't think the -30 will make a very noticeable difference, but the -32 gets me to spin better and avoid cramps.


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