Confused about rear hub widths….

Home Forum Bike Forum Confused about rear hub widths….

Viewing 8 posts - 1 through 8 (of 8 total)
  • Confused about rear hub widths….
  • your frame will be 135mm

    Kitz_Chris
    Member

    Axle length and hub width are not the same thing. Your frame is likely to be 135mm wide. I don’t know of any bikes currently using a different width with a standard 9mm QR.

    Premier Icon midlifecrashes
    Subscriber

    Wot he said. The axle is 145 to allow it to stick out a bit into the dropouts, but not all the way through otherwise the skewer wouldn’t hold it tight. The OLN (Over Lock Nuts) measurement will be 135 and should match the frame without any serious pushing or pulling.

    Premier Icon seadog101
    Subscriber

    Jimalmighty – Member

    your frame will be 135mm

    So why do the hubs, 145mm according to SRAM, fit into the same gap as my older ‘135mm’ wheels..

    Premier Icon midlifecrashes
    Subscriber

    The rear dropout inner faces are 135mm apart. Each is ~7mm thick. So the outside faces are ~149mm apart. The flanges or locknuts on the hub are 135mm apart and sit in the frame, with 5mm of axle protruding into each 7mm of dropout. This allows the faces of the QR nuts to sit on the outside of the dropout and cinch up tight to hold it all in place.

    Premier Icon midlifecrashes
    Subscriber

    The late, great Sheldon Brown wrote a lot of this stuff down and created a fantastic resource.

    http://sheldonbrown.com/gloss_n-o.html#old

    Premier Icon seadog101
    Subscriber

    Despite trying to search the forum and other web places I can’t quite figure out what’s what with hub widths at the back end.

    My bike has come with the previously standard (now niche?) rear 9mm QR on what I thought was a 135mm width. It’s a SRAM 506, which according to SRAM is 145mm width linky. Confusingly my old 135mm wheels fit my frame.

    As I want to upgrade my wheels, does this mean I can get away with 145mm hubs using the appropriate adapters to go with the 9mm QR’s?

    This is all part of a grand and gradual upgrade plan, better wheels, better frame, better this that and the other…

    Premier Icon seadog101
    Subscriber

    So I can forget about any thing describing itself as anything other than a 135mm then?

Viewing 8 posts - 1 through 8 (of 8 total)

The topic ‘Confused about rear hub widths….’ is closed to new replies.