I have Shimano 6603 groupset on a bike and am having problems selecting the smallest cogs. The STI doesn’t want to sequence to these gears unless I manually pull the cable to increase the tension. The small lever moves across but doesn’t do anything. In addition, the cable snapped a few days ago.
To me that sounds like a no brainer, too much friction somewhere in the cable run. But I’ve obviously now replaced the cable and it’s identical to before it broke (ie didn’t get better for a while). I’ve checked and re-checked the run and it seems fine. I’ve lubed the derailleur hinge and pivot points and the cable tension seems good. I’m left wondering if the STI lever itself may be cactus and the cable breaking (inside the mechanism, very handy to get out I can assure you!!) was just some sort of bizarre coincidence. I’ve thoroughly flushed the STI lever with WD-40 and spray lube.
Wondering if anyone else has had similar problems with ST-6603? Shimano seem happy to replace (bit under 12 months old with 6,000 km on the clock) but who knows how long that will take and don’t want to rip the thing off unnecessarily (only to discover it’s something else) as clearly the bike is then unusable.
To me that sounds like a no brainer, too much friction somewhere in the cable run. But I’ve obviously now replaced the cable and it’s identical to before it broke (ie didn’t get better for a while). I’ve checked and re-checked the run and it seems fine. I’ve lubed the derailleur hinge and pivot points and the cable tension seems good. I’m left wondering if the STI lever itself may be cactus and the cable breaking (inside the mechanism, very handy to get out I can assure you!!) was just some sort of bizarre coincidence. I’ve thoroughly flushed the STI lever with WD-40 and spray lube.
Wondering if anyone else has had similar problems with ST-6603? Shimano seem happy to replace (bit under 12 months old with 6,000 km on the clock) but who knows how long that will take and don’t want to rip the thing off unnecessarily (only to discover it’s something else) as clearly the bike is then unusable.