Disc front hub
Disc front hub
The one I have just built up has a higher flange on the disc side. That side has a flatter dish as well. Any pros or cons to that flange? It's staying whatever.
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rogerzilla
- Posts: 2915
- Joined: 9 Jun 2008, 8:06pm
Re: Disc front hub
A higher flange slightly improves the bracing angle, which means the spokes don't have to be as tight. This makes the tensions more equal (probably not completely so) from side to side.
Re: Disc front hub
in a disc brake front hub the tension balance (side to side) is usually around 65%. Using a hi-lo hub with a flange size difference of about 15mm in a 32x3 build improves the bracing angle such that you have about a 1% improvement in the tension balance (if you are lucky). So it 'isn't worth it' in that respect; you still have another 34% tension balance difference remaining....
To put this into perspective, if you can 'undish' the wheel by just 0.5mm (i.e. by taking a 0.5mm axle washer from the left side of the hub and moving it to the right) this improves the tension balance by about three times as much. [So if you don't mind it being non-standard, and want a stronger wheel and there is room to shuffle the disc + caliper leftwards by respacing the hub axle in that way, you would be daft not to...]
No, the reason for using the hi-lo hub design is the reduction in brake torque-induced spoke tension variations (vs a SF hub). If you do the sums you will find that between weight transfer and brake torque, when you use the brakes hard, some of the spokes in the front wheel will be getting pretty slack, and using larger flanges just makes this better.
However if the choice is between a hilo hub and a LF hub, the torque sharing is likely to be different between the two designs and it isn't simple exactly how; it will vary with the hub design, specifically with the torsional stiffness of the hub barrel.
cheers
To put this into perspective, if you can 'undish' the wheel by just 0.5mm (i.e. by taking a 0.5mm axle washer from the left side of the hub and moving it to the right) this improves the tension balance by about three times as much. [So if you don't mind it being non-standard, and want a stronger wheel and there is room to shuffle the disc + caliper leftwards by respacing the hub axle in that way, you would be daft not to...]
No, the reason for using the hi-lo hub design is the reduction in brake torque-induced spoke tension variations (vs a SF hub). If you do the sums you will find that between weight transfer and brake torque, when you use the brakes hard, some of the spokes in the front wheel will be getting pretty slack, and using larger flanges just makes this better.
However if the choice is between a hilo hub and a LF hub, the torque sharing is likely to be different between the two designs and it isn't simple exactly how; it will vary with the hub design, specifically with the torsional stiffness of the hub barrel.
cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
Re: Disc front hub
Cheers, just wondering. It is only a cheapy from ebay bought for it's price but seems really nice. Bet the bearings don't last long.
Re: Disc front hub
if you want the bearings to have a fighting chance, best service them whilst the hub is new, using proper lubricants not the rubbish that you will find inside the hub.
cheers
cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~