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Post by griftergli on Sept 18, 2009 20:15:36 GMT
here's a quickie: if a bmx rim is said to be "offset" what does this mean?
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Post by capitano on Sept 19, 2009 8:24:26 GMT
I know what it is, just don't know if I can explain it.
If you stand the wheel up vertically and draw a vertical line through the centre of the hub, the centre of the rim will be to one side of the line, depending on which side it is offset.
I hope that makes sense.
I'd do a pic and show it but I have to go shop for veg! ;D
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Post by BB on Sept 19, 2009 8:28:00 GMT
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Post by capitano on Sept 19, 2009 10:21:45 GMT
Aha that's summat different innit?
I guess one means that the wheel is offset and the other that the spoke holes are offset.
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Post by BB on Sept 19, 2009 10:23:43 GMT
 Just found that page but didnt understand what it meant 
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Post by griftergli on Sept 19, 2009 10:26:52 GMT
cheers for that link bb - will be paying close attention to it when i attempt to build my first wheel soon.... capitano - i think i get what your saying, do you know why you would want the rim offset? ps hope you got you veg alright |
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Post by capitano on Sept 19, 2009 11:06:47 GMT
Hey Gli, yes I did.
Best choice of the spuds and picked up a Romanesque caulifower, too.
I only really remember offset rims being used very briefly in the '90s on MTB rear wheels where downhillers were running trials motorcycle rims and tyres in hardtail bicycle frames.
The objective was to move the rear rim over to the non-drive side slightly so that the chain didn't foul on the tyre wen flaying around over huge bumps.
This probably means that it has nothing to do with your original query, but hey there's another useless fact for ya!
I understand the article Brett posted up. It basically means that spoke holes in "modern" rims are not all central like they used to be on older rims.
Half will be towards one side of the rim, and half towards the other. If you look from the back of the bike, the drive side is on the right, so al the spokes from that side of the hub will be laced to that side of the rim, not the opposite side.
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Post by griftergli on Sept 22, 2009 17:48:49 GMT
many cheers again capitano!! i've bought myself an "offset" bmx rim of the ebay so we'll see what it looks like when it turns up  it looks fairly modern (and was described as new) so i'd suspect the offset in the description indicates that the holes are offset to either side rather than central as you say - its all very exciting! a voyage of discovery |
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Post by capitano on Sept 22, 2009 21:01:26 GMT
No worries Gli. I hope it isn't offset like I described or it may produce some iffy handling characteristics on a 20" wheeled bike. ;D
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Post by alecw35 on Sept 22, 2009 21:33:44 GMT
I understand how a MTB wheel with lots of cogs would need an off set rim. So the spokes would be at more of an angle.
I thought BMXs had better spoke angles since there was only one cog.
Guess they will break anything with the harsh treatment that BMXing gives
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Post by griftergli on Sept 24, 2009 19:05:06 GMT
got my "offset" bmx rim now - everythings looks to be normal and as expected, i.e. not lop-sided! will post up a pic when i get the chance |
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Just found that page but didnt understand what it meant
it looks fairly modern (and was described as new) so i'd suspect the offset in the description indicates that the holes are offset to either side rather than central as you say - its all very exciting! a voyage of discovery 
