531

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• Offered: Make me an Offer I can't refuse !

  @531 started

  • 6 comments
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  @Itisaboutthebike replied
• Offered: Make me an Offer I can't refuse !

  in Components and clothing • 10 years, 11 months

  

  Sorry folks, Newbie to the forums, I will remove the thread, John.

• Offered: Make me an Offer I can't refuse !

  in Components and clothing • 10 years, 11 months

  

  For Sale item, already on ebay.

• An Uneven Number of Teeth ?

  in General • 11 years

  

  Thanks Ian, my worn out chainrings don't look as bad as that !

• An Uneven Number of Teeth ?

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• An Uneven Number of Teeth ?

  in General • 11 years

  

  Thanks TS agreed, did the end to end on that one, plus full touring kit.

• An Uneven Number of Teeth ?

  in General • 11 years

  

  On the question of derailleur gears, my most used c/w is a 47x 14 to 28, the granny gear is 36 c/w, which agrees again with Velocio.

• An Uneven Number of Teeth ?

  in General • 11 years

  

  Thanks for the post Velocio, that explains my puzzle, it's a pleasure to hear from someone so well informed.
  Regards, John.

• An Uneven Number of Teeth ?

  in General • 11 years

  

  Does anyone out there consistently use either a sprocket, chainwheel or both with an uneven number of teeth ? I've ridden a fixed gear for around 50 years, both for touring and racing, and always favoured:
  47x17, 47x18 or 47x19 for general use. I've had a sneaking feeling that an even number of teeth on both sprocket and chainwheel doesn't ride quite as smoothly. In addition, it may be possible for the chain to always turn in the same relative position with an even number of teeth on both.
  Your thoughts please.

• Chainline Question

  in Mechanics & Fixin' • 11 years

  

  Chainline for a single sprocket (fixed) is pretty simple. The same principles apply to double/triple chainwheels, and multiple sprockets. First measure the diameter of the seat tube close to the chainring (say 30mm) and divide by 2 =15mm. Then measure from the seat tube to the teeth on the chainring (say 27.5mm) for triples this should be to the centre ring, and for doubles to between the rings. The chainline would then be 27.5 + 15mm = 42.5mm.
  For the back wheel measure the width between the fork ends. Usually 120mm single speed, around 126mm for 5 to 7 speed, and multiple gears 130-135mm. Divide this by 2, say 60mm. Last measurement use a flat (check it on plate glass) 10mm open ended spanner, and bolt it on to the axle on the sprocket side of the wheel. Measure from the inner flat to the sprocket teeth say 17.5mm. For multiple sprockets measure to the middle cog teeth. The chainline for the wheel is therefore 60mm minus 17.5mm = 42.5mm. Differences can usually be adjusted by using chainring spacing washers, or spacers on the rear wheel.