[dan_mtcycle]

Anyone have an experience with the Shimano Ultegra Double Rear Derailleur or the Shimano 105? I'd like to mount this on my 2003 P2.

Fianlly, will I have to change the cassette and/or chain as well? I have a 11-32T Shimano mtb cassette, and a Shimano IG-31 chain.

 

[sub6]

yeah, should work fine. The "max cog" on those is like a 27t, but a lot of people run them all the way up to 32 with much success. Just run the B-tension screw pretty far in, I guess.

 

[SwisSlesS]

I'd say you should go with the 105. It's cheaper than the Ultegra, and either one you get, you're just gonna destroy anyway next time you mess up on a sidehop.

 

[D_D]

I have the ultegra, it's on a single speed cog so I can't comment on shifting.

So far it's had the stops that the limit screws rest on snaped off and the cable barrel adjuster snaped in half.

The ceramic bushing with little rubber seals on the upper jockey whell is the best jockey wheel I have ever used. It's a pity they used a cartridge bearing in the lower wheel.

If you are not riding in a lot of mud you won't get the full advantage of the good jockey wheels (not having to dismantle,clean,grrease after every ride).

I think using it with a 32t will most proberly work, there is a small chance that it won't work as well as the proper derailleur .

 

[MikeD]

Yeah, I like roadie rears...but a short-cage XT works, too...just up the spring tension before you mount it.

XT=better range, easier to get those big cogs included

Roadie=daaaamned strong spring, not a lot of mud clearance, you're forcing big cogs. I wouldn't run more than a 28t with one, myself...just don't like pushing things. It works at first, but after a while, troubles have a way of creeping into your setup.

 

[Matt D]

Tiagras are even less expensive, that's what i run on my DH bike. I go through too many of them to bother getting Ultegras.

You don't have to change the chain or cassete, unless you have bigger than a 32, then you may.

 

[PoweredByMt.Dew]

I run a Shimano 105 on my DH bike, works great, good shifting, and its small and compact. Id say either way you go, ultegra or 105 your set, but like swiss_less said, if you mess up the things toast, so if you dont want to drop alot of cash go with the 105. and no, you shouldnt have to change your chain, cog or anything else. Best of luck with whatever you choose!

 

[recidivist]

The Shimano road stuff is all supposed to max out at 28T, but sometimes you can cheat a god a bit higher.

Most of the time the actual capacity is determined by the position of the der hanger and the rear dropout. On a horizontal dropout, you'd most likely get better (or worse) than 28T.

If you want to try to cheat a couple more teeth in there, you could always try to bend your D hange ra bit -- just make sure it stays in plane, or you'll have sorts of shifting problems.

Oh yeah. Get cheap stuff. Maybe even TIagra/Deore. You're just gonna bust it up anyway.

 

[ChrisRobin]

Last season I used an Ultegra rear der. on my DH bike and after I broke it, I got a new LX der on. I honestly didn't notice a huge difference...if any at all. Both shifted really well. On a hardtail, a short cage der. is awesome.

 

[DHS]

i gotta take a picture of my 105 der, i've been using it on and off for like 3 seasons now and it has broke yet. it sure has been bashed up pretty good.
plus you could get the new Black 105 rear der. ooohhhh pretttyyyy

 

[pugslybell]

shimanos wrap number(28 tooth max) is for front der shifting, will work in single front chainrings no problem all the way up to 34 tooth as the der does not have to accomadat front chain ring slop. however bikes with serious chain growth issues, bullits and any other long travel high single pivot bikes, should stick to off road mechs as they can accomadate the growth better. from personal experiance do not run road der on bullits it will break and quickly

 

[D_D]

Originally posted by pugslybell
shimanos wrap number(28 tooth max) is for front der shifting, will work in single front chainrings no problem all the way up to 34 tooth as the der does not have to accomadat front chain ring slop. however bikes with serious chain growth issues, bullits and any other long travel high single pivot bikes, should stick to off road mechs as they can accomadate the growth better. from personal experiance do not run road der on bullits it will break and quickly

It's to do with the position of the rear mech hanger combined with the posistion of the axel hence the reason you can get 32 on one frame but only 28 on another.