What size band on front derailleur?

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  • Hey folks,

    I've got an old raleigh 531c steel frame and was wondering what size band on front dérailleur I would need? My seat post is 27.2mm and the circumference of the seat tube is 90mm and the diameter is 30mm.

    Not sure if any of that helps.

    Thanks

  • 28.6mm, sjs cycles sell them for a fiver

  • Brilliant, thank you

  • 28.6mm, sjs cycles sell them for a fiver

    So would the shim then mean I can fit a 32mm band?

  • very often bands are sold as 31.8mm with an insert, or shim, that takes the inside dimension down to the required 28.6mm

    this often applies to the 34.9 bands too, they have inserts for taking down to 31.8, and even 28.6 on occasion - check the literature before buying

  • Ah ok I get it, thanks so much for your help, most kind

  • no worries, just don't overtighten them.....oh..

  • n/a

  • AFAIK band-on derailleurs are available in 28.6mm, 31.8mm and 34.9mm.

    With this in mind, the answers to your questions are:

    1. No.
    2. n/a.

    Digital callipers are available on eBay for a fiver or so.

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What size band on front derailleur?

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