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Bill F
PostPosted: Sat Aug 07, 2004 8:57 pm 
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Location: Whitecourt AB CN
I'm looking to build a new front wheel for TT. Weight is a super issue but would appreciate some advice on the hub with the least bearing resistence. I have built wheels with Campy, Shimano, Tune, etc., etc. and price is not a primary consideration
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Bill F
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PostPosted: Sat Aug 07, 2004 8:58 pm 
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Location: Whitecourt AB CN
Correction. My post should read "weight is NOT a super issue"....... :oops:
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Joel
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PostPosted: Sat Aug 07, 2004 9:10 pm 
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Posts: 751
Location: Belgium
Zipp is very smooth, but much drag from the freewheel when not pedalling.
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popawheelie
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PostPosted: Sat Aug 07, 2004 9:13 pm 
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Joined: Thu Sep 26, 2002 3:42 pm
Posts: 1021
Location: in Colorado
I'm probably opening a can of worms but I've been riding my Dura Ace hubs lately and they are smooth and have little bearing resistance.
The bearings are free in the hub ( no carrier) and they are larger than my other wheels. If a bearing is twice as large in dia will it spin half as slow given the same wheel rpm?
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Joel
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PostPosted: Sat Aug 07, 2004 9:17 pm 
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Location: Belgium
No, when the wheel does 100 rpm, the bearing will do 100 rpm, no matter how big it is. The bearing will spin even faster (larger route in same time) when it's bigger. But the contact area will be bigger and the load will be better divided.
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danielgillett
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PostPosted: Sun Aug 08, 2004 12:47 am 
Have you tried or evaluated DT Swiss?

Their "Hugi" (pronounced Her-gee) range is probably the best hubs I have ever used - Phonak also use their hubs.

I use their XR4.1 Rims on my Bianchi MTB, and I can say that my experience with them is very positive.
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Cyco
 Post subject: Not Quite?
PostPosted: Sun Aug 08, 2004 2:26 am 
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Joel wrote:
No, when the wheel does 100 rpm, the bearing will do 100 rpm, no matter how big it is. The bearing will spin even faster (larger route in same time) when it's bigger


If the outer race is doing 100rpm the larger the ball the slower it has to spin. Try this as a mental picture wheel rolls along the road at a constant velocity which does more revolutions: the one the size of a jockey wheel of one the size of a road wheel?

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danielgillett
 Post subject: Re: Not Quite?
PostPosted: Sun Aug 08, 2004 3:11 am 
Cyco wrote:
Joel wrote:
No, when the wheel does 100 rpm, the bearing will do 100 rpm, no matter how big it is. The bearing will spin even faster (larger route in same time) when it's bigger


If the outer race is doing 100rpm the larger the ball the slower it has to spin. Try this as a mental picture wheel rolls along the road at a constant velocity which does more revolutions: the one the size of a jockey wheel of one the size of a road wheel?


Exactly. That's also why you have to calibrate the wheel size into your bike computer or HRM.
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jer
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PostPosted: Sun Aug 08, 2004 4:42 am 
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Location: Anchorage, AK
Dura-ace and probably Record have labyrinth (zero contact) seals.
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Joel
 Post subject: Re: Not Quite?
PostPosted: Sun Aug 08, 2004 2:44 pm 
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Location: Belgium
danielgillett wrote:
Cyco wrote:
Joel wrote:
No, when the wheel does 100 rpm, the bearing will do 100 rpm, no matter how big it is. The bearing will spin even faster (larger route in same time) when it's bigger


If the outer race is doing 100rpm the larger the ball the slower it has to spin. Try this as a mental picture wheel rolls along the road at a constant velocity which does more revolutions: the one the size of a jockey wheel of one the size of a road wheel?


Exactly. That's also why you have to calibrate the wheel size into your bike computer or HRM.


No, the outside of the wheel has a higher speed. The hub does as much rpm as the rim -if this is not so you have strange spokes :lol: - and because the diameter of the rim is bigger than the diameter of the hub, the speed is higher. But I think it's not about speed. I think that bigger bearings are better, altough their speed is bigger.
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martin
PostPosted: Sun Aug 08, 2004 5:33 pm 
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Joined: Wed Nov 27, 2002 9:49 am
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Location: München
Bill F wrote:
I'm looking to build a new front wheel for TT. Weight is a super issue but would appreciate some advice on the hub with the least bearing resistence. I have built wheels with Campy, Shimano, Tune, etc., etc. and price is not a primary consideration

The influence of bearing resistance in the total ammount of rolling resistance of a bicycle is lower than the measuring error.
The levers involved are 300mm (outer diameter of the whole wheel) against ~12mm (diameter of BB on hub)

Martin

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tigermon
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PostPosted: Sun Aug 08, 2004 5:54 pm 
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Hey, are we talking about linear or angular speed here?
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Irish
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PostPosted: Sun Aug 08, 2004 7:19 pm 
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Joined: Mon Jul 26, 2004 8:57 pm
Posts: 705
Location: Ireland
Try removing the grease from the hub/bearings & using parafin instead.The lower viscosity of parafin will reduce the drag in the hub but the parafin will have to be replaced before each event(the grease hole in campag hubs is handy for this).My 2c worth!
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Paul_nl
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PostPosted: Sun Aug 08, 2004 8:43 pm 
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Joined: Sat Nov 15, 2003 4:35 pm
Posts: 465
Location: The Netherlands
use ceramic bearings :lol:
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