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PostPosted: Sat Aug 01, 2020 10:13 pm 
GOLD | PoTM | Rider | rBOTM
GOLD | PoTM | Rider | rBOTM
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Joined: Tue Feb 26, 2013 6:26 pm
Posts: 22202
Location: Northest North Yorkshire. whippet real good...
Re the bars, remove stem bolt a screw win from other side against a couple of 2p coins to gently spread the bar clamp a little to aid bends.


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PostPosted: Sat Aug 01, 2020 10:31 pm 
Retro Guru

Joined: Fri Mar 02, 2012 7:46 pm
Posts: 1007
Can't say I've encountered a hanger extender before but I like the idea of it!

I've recently installed the same rear mech on a frameset I'm building up and in the smallest chainring and smallest sprocket the chain seems to rub on the cage. It goes away if I remove a chain link, however the chain is too short to go into the biggest sprocket (28t).

Would the extender remedy the rubbing on the mech cage? Can't quite get my head around it!

Sorry for the hijack on your thread as well.


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 Post subject: Re:
PostPosted: Sat Aug 01, 2020 10:57 pm 
Dirt Disciple

Joined: Fri Jun 26, 2020 12:02 pm
Posts: 35
Thanks for the suggestion History Man, unfortunately the stem clamp bolt is a through bolt with a nut, so there’s no thread in the stem itself to screw it back in to, I had to get a big flat head screw driver and prise the clamp open and then wedge a slightly thicker shin in, which is tricky when you’re also trying to push the bar through at the same time. I’m sure if I had some more tools and a bench vice to hold things properly I could have done it more easily, but I don’t at the moment so it’s not ideal and left a few marks, not terrible, but was bloody tight, they’ll be staying on the bike for the foreseeable now!


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 Post subject: Re:
PostPosted: Mon Aug 03, 2020 10:21 pm 
Dirt Disciple

Joined: Fri Jun 26, 2020 12:02 pm
Posts: 35
Martin, is the chain rubbing on the front derailleur cage or the rear derailleur cage? I don’t think the extender will help with this, sounds more like you’re getting rub from cross-chaining i.e. small chain ring to small cassette sprocket is too much of an angle across and not good for chain or sprocket wear/longevity, if it’s the front derailleur cage that’s rubbing that’s almost certainly the problem.

The extender is only going to help push the derailleur further away from the cassette, so the top jockey wheel has more clearance vertically to the biggest sprocket, allowing you to have a bigger diameter (more teeth) without the jockey wheel clashing with the sprocket, it’s basically turning a short cage derailleur into a medium/long cage derailleur, but it’s still won’t fix rubbing from cross chaining, you may need to just spend some more time adjusting the angle of the derailleur cage and cable tension (apologies if I’ve misunderstood your issue and not trying to teach you to suck eggs!)


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 Post subject: Re: Re:
PostPosted: Tue Aug 04, 2020 9:08 am 
Retro Guru

Joined: Fri Mar 02, 2012 7:46 pm
Posts: 1007
AWVelocetec86 wrote:
Martin, is the chain rubbing on the front derailleur cage or the rear derailleur cage? I don’t think the extender will help with this, sounds more like you’re getting rub from cross-chaining i.e. small chain ring to small cassette sprocket is too much of an angle across and not good for chain or sprocket wear/longevity, if it’s the front derailleur cage that’s rubbing that’s almost certainly the problem.

The extender is only going to help push the derailleur further away from the cassette, so the top jockey wheel has more clearance vertically to the biggest sprocket, allowing you to have a bigger diameter (more teeth) without the jockey wheel clashing with the sprocket, it’s basically turning a short cage derailleur into a medium/long cage derailleur, but it’s still won’t fix rubbing from cross chaining, you may need to just spend some more time adjusting the angle of the derailleur cage and cable tension (apologies if I’ve misunderstood your issue and not trying to teach you to suck eggs!)


Thanks! Do you know what - it's because the bike was upside down when I was setting it up, so it was slightly sagging on the cage when in the lowest gear! All sorted now!


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 Post subject: Re:
PostPosted: Wed Aug 05, 2020 6:33 pm 
Retro Guru

Joined: Wed Dec 10, 2008 9:19 am
Posts: 2674
I can see how the mech dropper will make sure the jockeys clear the 34 cog, but does the short cage mech take up enough slack, ie can you run big-big and small-small without it running slack like a cows udder or overstretching the mech

Nice bike btw, great colour


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