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Indexed front changer woes
Pal has given me a boxed mountain bike to put together. No real
problems until it came to getting the front triple changer to work. They are indexed handlebar mounted twist changers. How the hell do you adjust them? Ok position 1 and 3 to some extent by adjusting the stops on the front changer but position two? The solution I arrived at was to put the twist grip into 2 position with the cage at centre of the middle ring by wedging something against the frame and cage so it could not move and then drawing the cable tight with a pair of pliers and tightening the 9 mm cable bolt. This worked of a fashion - but because the rear block is a 7 indexed it does not work when in top or bottom cogs! On a friction lever operated system one merely adjusts for this with the lever but how the hell do you do this on index? Can it ever work properly? |
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#2
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Indexed front changer woes
On 2006-12-29, citizen142 wrote:
Pal has given me a boxed mountain bike to put together. No real problems until it came to getting the front triple changer to work. They are indexed handlebar mounted twist changers. How the hell do you adjust them? Ok position 1 and 3 to some extent by adjusting the stops on the front changer but position two? The solution I arrived at was to put the twist grip into 2 position with the cage at centre of the middle ring by wedging something against the frame and cage so it could not move and then drawing the cable tight with a pair of pliers and tightening the 9 mm cable bolt. This worked of a fashion - but because the rear block is a 7 indexed it does not work when in top or bottom cogs! On a friction lever operated system one merely adjusts for this with the lever but how the hell do you do this on index? Can it ever work properly? Is the cable completely slack when in the smallest front ring? I have found that if you have some tension in the cable in all positions, and adjust for the inner and outer rings with the limit screw, then the middle ring works out about right. But if it's scraping on the front mech in the middle ring in both the top and bottom rear cogs then there's no solution other than avoid using those gears, unless the shifter has some kind of "trim" facility. |
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Indexed front changer woes
citizen142 wrote:
Pal has given me a boxed mountain bike to put together. No real problems until it came to getting the front triple changer to work. They are indexed handlebar mounted twist changers. How the hell do you adjust them? Ok position 1 and 3 to some extent by adjusting the stops on the front changer but position two? The solution I arrived at was to put the twist grip into 2 position with the cage at centre of the middle ring by wedging something against the frame and cage so it could not move and then drawing the cable tight with a pair of pliers and tightening the 9 mm cable bolt. This worked of a fashion - but because the rear block is a 7 indexed it does not work when in top or bottom cogs! On a friction lever operated system one merely adjusts for this with the lever but how the hell do you do this on index? Can it ever work properly? Is there a front cable adjuster? If not, could one be fitted? ~PB |
#4
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Indexed front changer woes
"citizen142" wrote in news:SJ6lh.5331
: They are indexed handlebar mounted twist changers. How the hell do you adjust them? Hopefully, Sheldon Brown's page on Derailer Adjustment can help: http://sheldonbrown.com/derailer-adjustment.html |
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Indexed front changer woes
On 29/12/2006 11:11, citizen142 said,
Pal has given me a boxed mountain bike to put together. No real problems until it came to getting the front triple changer to work. They are indexed handlebar mounted twist changers. How the hell do you adjust them? Have you checked the manufacturer's website to see if there are downloadable instruction sheets? Shimano are quite good at that, for instance. -- Paul Boyd http://www.paul-boyd.co.uk/ |
#6
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Indexed front changer woes
In article
citizen142 wrote: Pal has given me a boxed mountain bike to put together. No real problems until it came to getting the front triple changer to work. They are indexed handlebar mounted twist changers. How the hell do you adjust them? Ok position 1 and 3 to some extent by adjusting the stops on the front changer but position two? The solution I arrived at was to put the twist grip into 2 position with the cage at centre of the middle ring by wedging something against the frame and cage so it could not move and then drawing the cable tight with a pair of pliers and tightening the 9 mm cable bolt. This worked of a fashion - but because the rear block is a 7 indexed it does not work when in top or bottom cogs! Sounds like you've got the adjustment right, although I'm surprised there isn't a cable adjuster on the shifter. As long as it's shifting cleanly with the chain in the middle of the block there's not much more you can do. |
#7
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Indexed front changer woes
citizen142 wrote:
Pal has given me a boxed mountain bike to put together. No real problems until it came to getting the front triple changer to work. They are indexed handlebar mounted twist changers. How the hell do you adjust them? Ok position 1 and 3 to some extent by adjusting the stops on the front changer but position two? The solution I arrived at was to put the twist grip into 2 position with the cage at centre of the middle ring by wedging something against the frame and cage so it could not move and then drawing the cable tight with a pair of pliers and tightening the 9 mm cable bolt. This worked of a fashion - but because the rear block is a 7 indexed it does not work when in top or bottom cogs! On a friction lever operated system one merely adjusts for this with the lever but how the hell do you do this on index? Can it ever work properly? Can't say I follow exactly what the problem is that your having, but as I found out recently when installing new shifters, if the cable does not follow the exact correct route to reach the anchor bolt the resulting parallelogram shape of the mechanism may be distorted and will never shift correctly. |
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