brodycycle

I have a triple crank, FD, and shifter all Shimano that I use for touring. The shifter needs to be rebuilt as it simply doe not shift, seems a ratcheting mechanism is not engaging and holding the position. For now I just run a double compact. Anyone rebuilt these?

JoeTBM 

Try flushing it with some PB blaster or WD-40 and work the ratcheting mechanism, sounds like the grease has gelled.

billyymc

That happened a couple years ago to my 105 rear shifter. Cleaning it wasn't a solution, as the teeth on the internal mechanisms had worn down to the point where they just slipped instead of shifted.

I'd be surprised if that happened on a front shifter because generally you dont' shift he front as much. But it could have. So try cleaning it as mentioned (I've cleaned them in hot soapy water before, then dried thoroughly and relubed).

When mine went bad I asked about rebuild here - the answer seemed to be that it's possible, but probably quite expensive and very difficult to get the parts. I bought a new set.

jimc101

No mention of the specific model/age of the shifter (105 covers a groupset that has been in production for decades)

It's going to be 5703 newest, which is 3 generations old, long OOP and warranty.

Add to that, Shimano shifters are not (in general) user-serviceable.

Unless the suggestions above work would be looking for a NOS replacement/alternate shifter.

dsbrantjr

For touring use, Gevenalle Audax with friction front and rear shifting are pretty much bulletproof: https://www.gevenalle.com/product/audax/
They also have indexed rear/friction front for 9-10-11 speed (you didn't mention what you've got) https://www.gevenalle.com/product/cx2/

brodycycle

Thank you all. I have 10 speed rear. They are all relatively old and have several thousand miles on them. I did clean and lube the rear shifter and it helped, but the front may well be worn out as said.

jimc101

Bar-end shifters are another option, had never used them before last year, I built an MTB drop bar conversion, and have put just under 5000km on in the last 18 months and they work great for short to long-distance riding, the only thing is going back to STI's I keep reaching for the bar end to shift

curbtender

Which series? The left/front shifter is usually easier to find used.

clasher

Amazon still has the st-5703 for sale brand new. I've seen replacement guts for this model on ebay too... dunno if they have the parts you need or not.