What Have You Fettled Today?

[fossyant]

The Bianchi mtb doesnt shift very well between the two front rings. Theres some play in the mech which I suspect is the problem but I figured I would try and get it sat as close to the rings as possible first to rule that out. It's a real pain as the direct mount bolts are behind the chainring so the chainset has to come off before you adjust the mech It makes it a bit more of a challenge to adjust it, largely guesswork and trial and error

Anyway, I got it as close as I dare. If it still doesnt shift properly I'll bite the bullet and order a new one

View attachment 496197

Your cage is bent. The top edge should be level (parallel) with the mech body (same applies on electric stuff) - it's been bashed/yanked.

The outer plate profile should follow the chainring

Unless you can get a new cage, that's a full front DI2 mech... £££££

 

[JhnBssll]

Hmm, I dont think it's bent? This is a screenshot from Wiggle of a new one, it looks the same as mine?

I suspect it will be a new mech needed anyway due to the play in the linkages

 

[fossyant]

I can see a massive design issue with the DI2.

 

[fossyant]

OK Bottom of mech.. - factory is parallel yours is not...

 

[fossyant]

Sorry, but it's been BENT.. unless you are skilled in fixing it... then stuffed...

 

[JhnBssll]

I still dont think it's bent

I do think it's broken though

 

[fossyant]

PS , get out the adjustable spanner and fix it. It's a steel cage.

My SRAM rear mech was a bit of a surprise to me compared to Shimano. They weigh nothing, but my goodness, they break easily.... I had to bend the rear cage back straight after I put some weight on the bike with no wheels in... light weight...

 

[fossyant]

Looking at the picture, I think the seat stay clamp has gone as the body isn't level to the tube.

PS It's £££'s

 

[JhnBssll]

Looking at the picture, I think the seat stay clamp has gone as the body isn't level to the tube.

PS It's £££'s

It's not mounted to the seat tube, it's a direct mount 👍

 

[fossyant]

It's not mounted to the seat tube, it's a direct mount 👍

Well , it's still looking very poorly..... I shall mourn your loss....

 

[JhnBssll]

I've had another look at it. It's not bent, in fact the cage is in pretty good shape. It shifts up on to the big ring fine with no problems but the slop in the linkages prevents it from shifting back down properly when theres any load on the chain. On the stand it works perfectly I'll give it a ride around thetford forest on friday afternoon and if it's still playing up I'll order a replacement

 

[Gunk]

It looks like it’s had a wallop, they’re not mega bucks, personally I’d just fit a new one.

my 12 year old XTR rear mech kept playing up, I wasted bloody hours degreasing, lubricating and trying to micro adjust it, I finally came to the conclusion that it was probably bent, I replaced it with a new Sram XO Mech and the shifting quality is now perfect.

 

[CXRAndy]

No bike fettling today, had to clear a slow draining sink in the bathroom,after trying some HG drain unbocker, which didn`t do much, tried rodding with curtain wire and only succeeded in making it a total blockage. So had to loosen sink so I could take out pedestal and undo trap, downstairs to kitchen sink, backflush and out popped lots of long hair, and half a toothbrush. Problem solved, reassemble and check it works, then tea, and relax. Bike waiting for tomorrow, new shifters for front FD and a test run.
john

We have the same issue once a year. I use our compressor with a blower attached. It clears all the crud out. Warning put an old cloth over the hole else all the crap will hit the ceiling and you

 

[CXRAndy]

@JhnBssll I have an spare front Di2 double derailleur. Make me a fair offer

 

[keithmac]

Gone from this,

to this

Been a right job, first engine was a write off, second one that was supposed to be a "drop in" refurbishment I ended up rebuilding after a list of faults as long as your arm!.

All good now though.