C & V Minutia: Skewer Springs
09-16-15, 03:55 PM
#51
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I remember when you could order just the springs from Cyclopedia. I had one get funky and crushed between the nut and the dropout. I ordered a new one so everything would be proper again.
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My C&V Bikes:
1972 Bottecchia Professional, 1972 Legnano Olympiade Record,
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09-16-15, 05:02 PM
#52
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Doing the math here, it boils down to (the dropout thickness PLUS the recess depth in the QR head or QR nut)...
...MINUS
(the axle end protrusion past the locknut PLUS the thickness of the compressed spring)
Sort of like (A+B) - (C+D) = the clearance that allows the dropout to be gripped by the QR's compressive force.
I once found myself riding in the Oakland hills with a Phil-hubbed front wheel rattling hopelessly in my UO8's thin fork dropouts...
09-17-15, 12:59 PM
#53
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ramzilla wrote:
two other variables i have noticed -
when rear mech is mounted with a hanger plate either the hanger plate or dropout can be non-flat. in such cases skewer cam travel is used to "flatten" them into place.
some skewers have less cam travel than others. one have found which is small in this regard is the gnutti skewer of the later sixties through the mid-seventies.
I replaced a rear wheel on an old Japanese bike recently & couldn't get the old skewer to properly tighten up until I discarded the damn little spring. Some kind of clearance problem I didn't have the patience to figure out.
two other variables i have noticed -
when rear mech is mounted with a hanger plate either the hanger plate or dropout can be non-flat. in such cases skewer cam travel is used to "flatten" them into place.
some skewers have less cam travel than others. one have found which is small in this regard is the gnutti skewer of the later sixties through the mid-seventies.
Last edited by juvela; 09-17-15 at 01:03 PM. Reason: spelling
09-17-15, 04:08 PM
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I was curious, so I looked the volute spring up online. These are a type of volute spring: https://en.wikipedia.org/wiki/Volute_spring
I guess I've seen them most commonly in pruning shears:
However, if we were to go with the colloquial use, "skewer spring" would suffice as there are no volute spring listings in cycling on ebay. They are relatively cheap.
You'd need to be a venerable volume volute seller with valuable voluntary purchasers and not just ebay voyeurs who view and then click away.
I guess I've seen them most commonly in pruning shears:
However, if we were to go with the colloquial use, "skewer spring" would suffice as there are no volute spring listings in cycling on ebay. They are relatively cheap.
You'd need to be a venerable volume volute seller with valuable voluntary purchasers and not just ebay voyeurs who view and then click away.
Man, you got me.
09-18-15, 12:24 AM
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...two other variables i have noticed -
when rear mech is mounted with a hanger plate either the hanger plate or dropout can be non-flat. in such cases skewer cam travel is used to "flatten" them into place.
some skewers have less cam travel than others. one have found which is small in this regard is the gnutti skewer of the later sixties through the mid-seventies.
This does present a small difficulty when a particular rear wheel is used on different bikes with and without claw hangers.
And a similar situation arises when a nutted axle is used on a bike with a claw hanger on the drive side, the driveside end needs to be that much longer.
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