R7000/R8000 left shifter troubles and fixes

[chicagorider]

Hi all,

Just wanted to see if others have experienced a similar problem with R7000 and R8000 left shifters that, over time, have trouble shifting the front chainring. I've traced the problem to a worn plastic bit inside where a metal hook is supposed to catch to shift the chainrings.

My solution to date has been to cut up a bit of credit card and superglue it - which works fine but I don't think it's a good permanent solution. (see picture - the purple is the bit of credit card that I superglued). I wanted to hear how others have resolved the issue!

https://www.dropbox.com/s/p7porsm32k...NIGHT.jpg?dl=0

Thanks!

[harryschwartzma]

Ive ordered the plastic bit from Shimano and I remember it being stupidly expensive (but critical) but next time I'm going to use your solution!

[chicagorider]

Originally Posted by harryschwartzma

Ive ordered the plastic bit from Shimano and I remember it being stupidly expensive (but critical) but next time I'm going to use your solution!

Do you happen to recall the part number/where you ordered from? Thanks!

[Carbonita]

I've had my 105 break just before a Sea Otter ride. Printed one up:

https://www.myminifactory.com/object...support-188216

Then ebay'd the part for backup: Y63X80010

[chicagorider]

Thank you! (and I wish I had a 3D printer!)

[Carbonita]

You may want to check your local library. All of my local ones have two 🤓

[chicagorider]

Originally Posted by Carbonita

You may want to check your local library. All of my local ones have two 🤓

I think mine does too! Can't even find the parts on eBay now so this might be only way!

[Carbonita]

Lucky you -- This is the perfect first print project! Small, and hence fast to print. My library only allows PLA (safe fumes), but use ABS if you can. PLA softens in really hot air, like when the bike is stored inside the car (my bike locker!) in summer. This part is not under stress/pressure when at rest (versus shifting), so PLA will probably be fine.

[Carbonita]

BTW, I needed to tweak the thickness for my r7000, so if you do as well, the CAD file is here
https://www.tinkercad.com/things/hUC...inshifterlever

[Carbonita]

These plastic bits, poorly designed IMHO, keep failing for me. I've designed a new version. If anyone else wants the CAD, I'll post. But not fully tested in the crucible of the hills round these parts!