I’d like to put my road bike wheels on my tri bike for a windy ride as they have no depth at all. I have an 11-32 cassette on the road wheels and think I might have the short cage rear derailleur which is only rated to 28T according to Shimano but I can’t find any information on the derailleur dimensions to check it.
I’ve put the wheel on my tri bike and it seems fine on the 32 in the little chainring. I would never use the 32 if I was in the big ring. Even if this is the short cage, should I be ok or will I break my bike?
Thanks!
It’s interesting that you posted this. I actually was experimenting with this today on my TT bike. I have been running a 11-32 on my road bike(Dura Ace mechanical) for a season now. I was good to go with turning the B adjustment screw all the way in, no problems, works just fine. However, my TT Bike has Dura Ace Di2. After fully seating the B adjustment screw, there is still some contact with the top pulley and the 32 cog. I mean you could ride it that way, the crank still turns of course, and the chain moves along relatively unencumbered, but you are slightly riding on the jockey wheel.
If anyone else has other ideas to make this work, I’m all ears.
I’ll check but I don’t seem to have any contact between the 32 cog and the pulley. Not sure I that means I have the medium cage? Or perhaps my Ultegra Di2 has different dimensions from the Dura-ace.
The Ultegra is available in a medium cage which is rated for 32T, but I can’t find any measurement information to tell me which I have.
If I have no contact between the cog and the pulley, am I good to go?
The limit is 33t on the di2 shifter. What that means is if you use 11-32 on rear (i.e. 21t diff) you can only run max difference up front of 11t e.g. on a 130bcd crank 52/42 (10t) or 53/42 (11t).
If you google DA9000 & Di2 and 11-32 you’ll find examples of where people have managed, it can be frame rear derailleur hanger dependent and you’ll have to adjust the B-limit screw a lot.
Thus it may work depending on chainrings and total tooth range.
Would not condone exceeding that 33t limit although some articles on web might suggest you can without resorting to something like Wolftooth’s goatlink.
Regards
David
I’d like to put my road bike wheels on my tri bike for a windy ride as they have no depth at all. I have an 11-32 cassette on the road wheels and think I might have the short cage rear derailleur which is only rated to 28T according to Shimano but I can’t find any information on the derailleur dimensions to check it.
I’ve put the wheel on my tri bike and it seems fine on the 32 in the little chainring. I would never use the 32 if I was in the big ring. Even if this is the short cage, should I be ok or will I break my bike?
Thanks!
In the time it took you to come here on slowtwitch to write that message you could have swapped cassettes, probably. Plus that would also prevent you from having to check and possibly change your chainlength.
Or change the derailleur for the medium cage version…which is what I did. I did have to change my chain length, but practice is always useful.
A very straightforward fix and a better option for hilly Lanzarote.