5700 v 5701 Rear Mech

gbsahne001

Looking to change the rear mech after 10k miles, as the current Tiagra mech was second hand in the first instance.

Narrowed it down to either of the 2 mechs but is there any difference between the 2?

dgunthor

"I think the main difference between the 5700 and 5701 is that the 5700 will take a max sprocket of 28T regardless of cage, however the 5701 will take a 30T sprocket (short cage) or a 32T sprocket (medium cage, depending on chainset)."

gbsahne001

or is it that the 5701 isn't compatible with 8/9/10 drive trains?

Wiggle:

Shimano 105 RD-5700 Rear Derailleur
Short Cage
Large 11 tooth pulleys increase service life and reduce noise
Super light shift action
Compatible with 8, 9, and 10-speed drivetrains
Maximum low sprocket 30T
Maximum front difference 16T, total capacity 34T
Average weight 221 grams

CRC

Shimano 105 5701 10 Speed Rear Mech
10-speed 105 wide link rear derailleur.
Features:
• Advanced Wide Link design increases rigidity and shifting performance
• Super stiff for fast and accurate changes across the cassette
• Large 11 tooth pulleys increase service life and reduce noise
• Super light shift action
• Compatible with: 10-speed drivetrains
• Maximum low sprocket: 30T (short)/32T (med) with double chainset
• Maximum front difference: 16T, total capacity 34T (short)/22T, total capacity 40T (med)
• Weight: 221g (short), 232g (med)

Man Of Lard

Looking in Shimano's techdocs - there are the following variants - all tagged as "10 speed" in the title of the exploded view (EV) diagrams:

RD-5700 (-L (black)/ -S (silver)) (SS/GS - Short/Long cage)
RD-5700-A (-L (black)/ -S (silver)) (SS/GS - Short/Long cage)
RD-5701 (-L (black)/ -S (silver)) (SS/GS - Short/Long cage)

I'm 99.9% sure that all of the "10 speed" are usable with 8 or 9 speed drive trains though (as Wiggle have done)

gbsahne001

After all that, remembered I had a serviceable old Dura Ace rear mech in the attic. The difference in weight between the Tiagra coming off and the DA is very noticeable. Just wish I'd had some a spare gear cable, as reusing the existing meant a 5mm tail exiting the rear mech...may have to put it on the to do list.