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#1
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Front Mech Recomendations
Does anyone know of a front Mech that will work with a 48 Tooth Top ring ?
I've been looking all over the web, and not much joy. TIA |
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#2
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Front Mech Recomendations
Graham Wakley wrote:
Does anyone know of a front Mech that will work with a 48 Tooth Top ring ? I've been looking all over the web, and not much joy. TIA Whats the problem, front mechs have a range such as 22 teeth which is the different between the largest and smallest. Surely you set up a front mech at the correct distance from the large ring (about 2mm) regardless of is diameter( which is related to its number of teeth). Does you frame have a braze on mount which is not close enough ? |
#3
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Front Mech Recomendations
"MSeries" wrote in message ... Graham Wakley wrote: Does anyone know of a front Mech that will work with a 48 Tooth Top ring ? I've been looking all over the web, and not much joy. TIA Whats the problem, front mechs have a range such as 22 teeth which is the different between the largest and smallest. Surely you set up a front mech at the correct distance from the large ring (about 2mm) regardless of is diameter( which is related to its number of teeth). Does you frame have a braze on mount which is not close enough ? You get better changing if the curve of the mech cage matches the curve of the sprocket. Paul. |
#4
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Front Mech Recomendations
"Graham Wakley" wrote in message ... Does anyone know of a front Mech that will work with a 48 Tooth Top ring ? I've been looking all over the web, and not much joy. TIA Sorry, some other important info: The diameter is 31.8, bottom pull.. |
#5
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Front Mech Recomendations
Paulmouk wrote:
You get better changing if the curve of the mech cage matches the curve of the sprocket. Paul. Interesting point. I have used Shimano 105 front mechs with 50, 52, 53 round and 52 teeth biopace rings, all on separate chainsets of course. All work perfectly. |
#6
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Front Mech Recomendations
Graham Wakley wrote:
Sorry, some other important info: The diameter is 31.8, bottom pull.. Is this a triple? What about Shimano XTR - I think that is still non-compact drive? |
#7
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Front Mech Recomendations
"MSeries" wrote in message ... Paulmouk wrote: You get better changing if the curve of the mech cage matches the curve of the sprocket. Paul. Interesting point. I have used Shimano 105 front mechs with 50, 52, 53 round and 52 teeth biopace rings, all on separate chainsets of course. All work perfectly. 27 speed mtb triples are fussy about relative ring sizes, I suffered all kinds of grief when swapping a 32 middle for a 34 but my old 21 speeds were far more tolerant. However, the OP hasn't stated the number of gears he's running anyway, so OP, more details please. Pete |
#8
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Front Mech Recomendations
"Graham Wakley" wrote in message ... "Graham Wakley" wrote in message ... Does anyone know of a front Mech that will work with a 48 Tooth Top ring ? I've been looking all over the web, and not much joy. TIA Sorry, some other important info: The diameter is 31.8, bottom pull.. I use a standard Ultegra front mech on my commuting/cross/touring bike that has a Ultegra double chainset with a 48 tooth chainring - works fine. Regards Simon |
#9
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Front Mech Recomendations
Simon Galgut wrote: "Graham Wakley" wrote in message ... "Graham Wakley" wrote in message ... Does anyone know of a front Mech that will work with a 48 Tooth Top ring Sorry, some other important info: The diameter is 31.8, bottom pull.. I use a standard Ultegra front mech on my commuting/cross/touring bike that has a Ultegra double chainset with a 48 tooth chainring - works fine. I have a 105 running on a 39 and also on a 60. John B |
#10
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Front Mech Recomendations
Graham Wakley wrote in message ... Does anyone know of a front Mech that will work with a 48 Tooth Top ring ? I've been looking all over the web, and not much joy. Are you running road or MTB shifters? Generally speaking, you'll get better shifting on 48 with a road mech (50-53 norm) than an MTB mech (42-46). The curve mismatch on an MTB mech tends to force the front mech higher up the seat tube to avoid the tail fouling the chainring, whilst a road mech will just have the tail of the mech a bit further from the middle/inner rings than it already is. Ideal will be one of the old pre-compact drive MTB front mechs, but they are a bit rare now (SJSC have 93 XT at about £50). If you use a road mech with MTB shifters, the cable pull will be too much. You may be able to deal with this by screwing down the stops, but I've never tried it. Using an MTB mech with road shifters, where the cable pull is not enough, it is often OK the increase the movement per cable pull by clamping the cable on the wrong side of the clamp bolt. I used to use old XT with road STI by doing this - I now use a 105 mech after the old one died. Andrew (12-27 x 24/36/48) |
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