by OliverBendix on Fri 4/Jun/10 10:46am
by pushbikerider on Fri 4/Jun/10 10:51am
by yeahnah on Fri 4/Jun/10 11:00am
by OliverBendix on Fri 4/Jun/10 11:29am
by yeahnah on Fri 4/Jun/10 11:55am
by OliverBendix on Fri 4/Jun/10 12:08pm
by danose on Fri 4/Jun/10 1:31pm
OliverBendix wrote:Fisher Mamba. With the current derailleur it just fits a 2.25 Ardent.
Sounds like I at least know what the trouble is now, thanks guys.
by rackerrack on Sat 5/Jun/10 10:40am
by yeahnah on Sat 5/Jun/10 12:21pm
by OliverBendix on Sat 5/Jun/10 5:38pm
danose wrote:OliverBendix wrote:Fisher Mamba. With the current derailleur it just fits a 2.25 Ardent.
Sounds like I at least know what the trouble is now, thanks guys.
think of it's as gods way of telling you to go 1x9![]()
will 100% fix your problem - and I'm sure you don't really want functioning knees anyway
by Spokes on Sat 5/Jun/10 5:49pm
OliverBendix wrote:Mechanical gurus - why does my chain sometimes jam while shifting down to the granny or middle on the front? This is with a new chain and rings, cleanish, lubed, and happens while I'm shifting under no or very low load - just spinning the chain over gently, not putting any power in.
It seems like the chain shifts down OK when the derailleur hits it, but the section remaining on the bigger ring doesn't drop off. The result is that the chain gets jammed in the derailleur cage or against the frame.
As I haven't done this under any tension, I haven't broken anything yet but with this and some ordinary mud-related chainsuck a few weeks ago I've lost a fair bit of chainstay paint off a nice new frame. The chain hasn't dinged the metal too badly - just some surface scratches. I had armoured it up with tape etc but this morning's failed shift to the middle ring pulled the tape off. There's very little clearance there, just a couple of mm between rings and frame, which I suppose is a compromise for more tyre clearance.
Any suggestions for fixing the problem, and armouring the chainstay to save it from future occurences or ordinary chainsuck will be most welcome.
by FSR_Man on Sat 5/Jun/10 6:18pm
Spokes wrote:OliverBendix wrote:Mechanical gurus - why does my chain sometimes jam while shifting down to the granny or middle on the front? This is with a new chain and rings, cleanish, lubed, and happens while I'm shifting under no or very low load - just spinning the chain over gently, not putting any power in.
It seems like the chain shifts down OK when the derailleur hits it, but the section remaining on the bigger ring doesn't drop off. The result is that the chain gets jammed in the derailleur cage or against the frame.
As I haven't done this under any tension, I haven't broken anything yet but with this and some ordinary mud-related chainsuck a few weeks ago I've lost a fair bit of chainstay paint off a nice new frame. The chain hasn't dinged the metal too badly - just some surface scratches. I had armoured it up with tape etc but this morning's failed shift to the middle ring pulled the tape off. There's very little clearance there, just a couple of mm between rings and frame, which I suppose is a compromise for more tyre clearance.
Any suggestions for fixing the problem, and armouring the chainstay to save it from future occurences or ordinary chainsuck will be most welcome.
Are the new rings the same brand as the crank?
by OliverBendix on Sat 5/Jun/10 6:36pm
Spokes wrote:Are the new rings the same brand as the crank?
This is the problem, I think, as I posted above. The derailleur is too high, but I can't move it down as the end of the cage is just clearing the chainstay in middle/granny. I'm going to the shop tomorrow to replace the cassette that's cracked a cog, and I'll see if a different derailleur will fit the frame design better.FSR_man wrote:1-3mm gap between the top of the biggest chainring and the bottom of the deralier cage when shifting into the biggest chainring.
by Mr_Bob on Mon 7/Jun/10 7:04pm
by SlackBoy on Mon 7/Jun/10 7:07pm
hand it back to him and charge him for a new one. Put on the invoice - Stupidity TaxMr_Bob wrote:X9 right hand shifters, I've got a customer that's just bought me a bag of shifter parts (they're all there) any tips on rebuilding one? - I've searched around sicklines and pinkbike forums ect....
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