|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
REar Shifters and folding bikes
A friend has a Dahon folding bike which has a 6 speed rear sprocket setup. He is wondering what he could do if either the shifter or the rear sprocket were to wear out as he reckons that the 6 speed setup might not be readily available. Would the 6 speed be a free wheel or a cassette? Can a 6 speed be replaced with a 7 speed, or more, shifter and cassette/free wheel, without radical modification? I gather, from looking at adverts and "tests" that the 7 speed Dahon has a cassette and I believe that the 6 and 7 speed "cog set" are the same width so is it likely that if he can't replace the 6 speed bits that a conversion would be relatively easy? New cassette, shifter and maybe derailer? -- Cheers, John B. |
Ads |
#2
|
|||
|
|||
REar Shifters and folding bikes
On Tuesday, April 14, 2015 at 11:05:13 PM UTC-4, John B. Slocomb wrote:
A friend has a Dahon folding bike which has a 6 speed rear sprocket setup. He is wondering what he could do if either the shifter or the rear sprocket were to wear out as he reckons that the 6 speed setup might not be readily available. Would the 6 speed be a free wheel or a cassette? Can a 6 speed be replaced with a 7 speed, or more, shifter and cassette/free wheel, without radical modification? I gather, from looking at adverts and "tests" that the 7 speed Dahon has a cassette and I believe that the 6 and 7 speed "cog set" are the same width so is it likely that if he can't replace the 6 speed bits that a conversion would be relatively easy? New cassette, shifter and maybe derailer? -- Cheers, John B. If it's a Shimano Uniglide cassette then it's very likely that the last cog is a screw on one unless the hub is one of the transitional ones that would take either a Uniglide or Hyperglide cassette. Cheers |
#3
|
|||
|
|||
REar Shifters and folding bikes
On Tue, 14 Apr 2015 20:16:34 -0700 (PDT), Sir Ridesalot
wrote: On Tuesday, April 14, 2015 at 11:05:13 PM UTC-4, John B. Slocomb wrote: A friend has a Dahon folding bike which has a 6 speed rear sprocket setup. He is wondering what he could do if either the shifter or the rear sprocket were to wear out as he reckons that the 6 speed setup might not be readily available. Would the 6 speed be a free wheel or a cassette? Can a 6 speed be replaced with a 7 speed, or more, shifter and cassette/free wheel, without radical modification? I gather, from looking at adverts and "tests" that the 7 speed Dahon has a cassette and I believe that the 6 and 7 speed "cog set" are the same width so is it likely that if he can't replace the 6 speed bits that a conversion would be relatively easy? New cassette, shifter and maybe derailer? -- Cheers, John B. If it's a Shimano Uniglide cassette then it's very likely that the last cog is a screw on one unless the hub is one of the transitional ones that would take either a Uniglide or Hyperglide cassette. Cheers May Be. I had a look at the Dahon site and they showed a picture of what they said was a seven speed cassette and it looked just like my 9 and 10 speed cassettes with the separate screw in cap. They make a 8 speed that they say uses a Hyperglide cassette but the 7 and 6 speed don't seem to include detailed specifications. -- Cheers, John B. |
#4
|
|||
|
|||
REar Shifters and folding bikes
On 4/14/2015 10:05 PM, John B. Slocomb wrote:
A friend has a Dahon folding bike which has a 6 speed rear sprocket setup. He is wondering what he could do if either the shifter or the rear sprocket were to wear out as he reckons that the 6 speed setup might not be readily available. Would the 6 speed be a free wheel or a cassette? Can a 6 speed be replaced with a 7 speed, or more, shifter and cassette/free wheel, without radical modification? I gather, from looking at adverts and "tests" that the 7 speed Dahon has a cassette and I believe that the 6 and 7 speed "cog set" are the same width so is it likely that if he can't replace the 6 speed bits that a conversion would be relatively easy? New cassette, shifter and maybe derailer? If it's a freewheel, (likely, but check that) several current models range from affordable down to dirt cheap. Use a five/six chain for best shifting and longevity, also cheap. Changers and shifters are plentiful if needed. If it's a six cassette there is virtually no support for UG systems and no aftermarket products at all. Once worn out, it's a new wheel or at least a hub but wheels are inexpensive in comparison to a rebuild. I can't see much benefit of changing it to a seven freewheel, but it can be done with a small axle spacing change, re center rim, seven shifter and a seven chain. It will have 16% more choices but won't be 16% better overall. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#5
|
|||
|
|||
REar Shifters and folding bikes
On 4/15/2015 5:59 AM, John B. Slocomb wrote:
On Tue, 14 Apr 2015 20:16:34 -0700 (PDT), Sir Ridesalot wrote: On Tuesday, April 14, 2015 at 11:05:13 PM UTC-4, John B. Slocomb wrote: A friend has a Dahon folding bike which has a 6 speed rear sprocket setup. He is wondering what he could do if either the shifter or the rear sprocket were to wear out as he reckons that the 6 speed setup might not be readily available. Would the 6 speed be a free wheel or a cassette? Can a 6 speed be replaced with a 7 speed, or more, shifter and cassette/free wheel, without radical modification? I gather, from looking at adverts and "tests" that the 7 speed Dahon has a cassette and I believe that the 6 and 7 speed "cog set" are the same width so is it likely that if he can't replace the 6 speed bits that a conversion would be relatively easy? New cassette, shifter and maybe derailer? -- Cheers, John B. If it's a Shimano Uniglide cassette then it's very likely that the last cog is a screw on one unless the hub is one of the transitional ones that would take either a Uniglide or Hyperglide cassette. Cheers May Be. I had a look at the Dahon site and they showed a picture of what they said was a seven speed cassette and it looked just like my 9 and 10 speed cassettes with the separate screw in cap. They make a 8 speed that they say uses a Hyperglide cassette but the 7 and 6 speed don't seem to include detailed specifications. Early (1970s through about 1986? 7?) cassette hubs/bodies were UG format, in which the last sprocket screws on. Current type is HG using a separate lockring. The seven bodies are too short for 8/9/10 cassettes. The current cassette body can run a seven with one spacer behind low gear and that is a very common setup. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#6
|
|||
|
|||
REar Shifters and folding bikes
On Wed, 15 Apr 2015 07:47:20 -0500, AMuzi wrote:
On 4/14/2015 10:05 PM, John B. Slocomb wrote: A friend has a Dahon folding bike which has a 6 speed rear sprocket setup. He is wondering what he could do if either the shifter or the rear sprocket were to wear out as he reckons that the 6 speed setup might not be readily available. Would the 6 speed be a free wheel or a cassette? Can a 6 speed be replaced with a 7 speed, or more, shifter and cassette/free wheel, without radical modification? I gather, from looking at adverts and "tests" that the 7 speed Dahon has a cassette and I believe that the 6 and 7 speed "cog set" are the same width so is it likely that if he can't replace the 6 speed bits that a conversion would be relatively easy? New cassette, shifter and maybe derailer? If it's a freewheel, (likely, but check that) several current models range from affordable down to dirt cheap. Use a five/six chain for best shifting and longevity, also cheap. Changers and shifters are plentiful if needed. If it's a six cassette there is virtually no support for UG systems and no aftermarket products at all. Once worn out, it's a new wheel or at least a hub but wheels are inexpensive in comparison to a rebuild. I can't see much benefit of changing it to a seven freewheel, but it can be done with a small axle spacing change, re center rim, seven shifter and a seven chain. It will have 16% more choices but won't be 16% better overall. I'm not into folding bikes but the guy thought, for whatever reason, that if his handlebar shifter failed that he wouldn't be able to get another one. The bike is, perhaps, a year old and I had told him that he shouldn't have any problems with the shifting, other then perhaps adjustments, for a few years. But, from what you say, he should have no problem replacing a six speed so I'll tell him so he can stop worrying :-) -- Cheers, John B. |
#7
|
|||
|
|||
REar Shifters and folding bikes
On Wed, 15 Apr 2015 07:53:56 -0500, AMuzi wrote:
On 4/15/2015 5:59 AM, John B. Slocomb wrote: On Tue, 14 Apr 2015 20:16:34 -0700 (PDT), Sir Ridesalot wrote: On Tuesday, April 14, 2015 at 11:05:13 PM UTC-4, John B. Slocomb wrote: A friend has a Dahon folding bike which has a 6 speed rear sprocket setup. He is wondering what he could do if either the shifter or the rear sprocket were to wear out as he reckons that the 6 speed setup might not be readily available. Would the 6 speed be a free wheel or a cassette? Can a 6 speed be replaced with a 7 speed, or more, shifter and cassette/free wheel, without radical modification? I gather, from looking at adverts and "tests" that the 7 speed Dahon has a cassette and I believe that the 6 and 7 speed "cog set" are the same width so is it likely that if he can't replace the 6 speed bits that a conversion would be relatively easy? New cassette, shifter and maybe derailer? -- Cheers, John B. If it's a Shimano Uniglide cassette then it's very likely that the last cog is a screw on one unless the hub is one of the transitional ones that would take either a Uniglide or Hyperglide cassette. Cheers May Be. I had a look at the Dahon site and they showed a picture of what they said was a seven speed cassette and it looked just like my 9 and 10 speed cassettes with the separate screw in cap. They make a 8 speed that they say uses a Hyperglide cassette but the 7 and 6 speed don't seem to include detailed specifications. Early (1970s through about 1986? 7?) cassette hubs/bodies were UG format, in which the last sprocket screws on. Current type is HG using a separate lockring. The seven bodies are too short for 8/9/10 cassettes. The current cassette body can run a seven with one spacer behind low gear and that is a very common setup. Thanks for that and I'll tell him. -- Cheers, John B. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Folding Bikes | John B.[_3_] | Techniques | 28 | November 25th 13 12:58 AM |
Folding/removable SPD-compatible pedals for folding bikes? | Alan Hoyle | General | 1 | April 25th 07 03:22 PM |
Folding bikes | elyob | UK | 7 | August 7th 05 04:58 PM |
Folding bikes | Tom Spence | General | 5 | March 25th 05 08:34 PM |
Folding Bikes | icewhain | Mountain Biking | 6 | July 16th 04 03:14 PM |