Looking for advice - Sora / Tiagra compatibility with Deore

themightyw

Hi there

Looking at making some changes to my 'do it all' bike - an Uncle John currently fitted with:

- Sora FD and shifters
- Tiagra RD
- Shimano Sport chainset
- Avid Shorty 4 brakes

The FD / chainset and rear mech are all a bit worse for wear and I'm considering looking at replacing them all with Deore LX for a bit more robustness, as I'm doing a fair bit more trail riding / touring than I did when I first built the bike.

- Should my existing Sora shifters work fine with the Deore components? Any compelling reason why I should upgrade the shifters too?
- Any issues with changing my Bonty Sport cranks to Deore? Will I need to make any other changes?

Would appreciate any advice, as I'm something of a novice with all this malakey. Thanks

TMW

PeterBL

A Deore FD will not work with your Sora shifters. RD will be fine (if you get 9-speed).

Chainset? Depends on what rings you put on and what you have now.

themightyw

Thanks for that. What's the reason for the incompatibility with the Sora shifters? Both would be triples.

CarlosDSanchez

For some reason Shimano road sti's pull a different amount of cable than MTB shifters. It's worth giving it a try though. Also attaching the cable for the fd on the opposite side of the pinch bolt to normal may help.

redvee

In the past I've mixed Deore & Sora with no issues.

Shiters were Sora 3x8 3300
Front mech Deore Multifit
Chainset M440 but only used the middle & outer rings
Rear Mech Alivio I think.

I tried Sora FM and shifters but it would index on the MTB chainset, as soon as I fitted the MTB front mech all the shifting issues stopped.