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#1
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What seat post clamp?
I want to order online a QR seatpost clamp for a bike I won't see
until Monday. I know the diameter is less than 31.8mm because I have a couple of clamps that size spare and they don't fit. The frame is described as 7005-T6. Can I tell from that if I should order a 30mm clamp or 28.6mm clamp? Or will I have to wait until Monday when I can measure the diameter? |
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#2
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What seat post clamp?
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#3
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What seat post clamp?
Tom Crispin wrote:
I want to order online a QR seatpost clamp for a bike I won't see until Monday. I know the diameter is less than 31.8mm because I have a couple of clamps that size spare and they don't fit. The frame is described as 7005-T6. Can I tell from that if I should order a 30mm clamp or 28.6mm clamp? Or will I have to wait until Monday when I can measure the diameter? Sorry I don't know - but I'm wondering if there really is a 30mm standard - or if that is a round-up euphemism for 28.6mm, just as "32mm" is for 31.8mm? ~PB |
#4
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What seat post clamp?
On Sat, 16 Feb 2008 15:12:32 -0000, "Pete Biggs"
wrote: Tom Crispin wrote: I want to order online a QR seatpost clamp for a bike I won't see until Monday. I know the diameter is less than 31.8mm because I have a couple of clamps that size spare and they don't fit. The frame is described as 7005-T6. Can I tell from that if I should order a 30mm clamp or 28.6mm clamp? Or will I have to wait until Monday when I can measure the diameter? Sorry I don't know - but I'm wondering if there really is a 30mm standard - or if that is a round-up euphemism for 28.6mm, just as "32mm" is for 31.8mm? http://www.chainreactioncycles.com/M...?ModelID=15692 |
#5
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What seat post clamp?
Tom Crispin wrote:
I want to order online a QR seatpost clamp for a bike I won't see until Monday. I know the diameter is less than 31.8mm because I have a couple of clamps that size spare and they don't fit. The frame is described as 7005-T6. Can I tell from that if I should order a 30mm clamp or 28.6mm clamp? Or will I have to wait until Monday when I can measure the diameter? Sorry I don't know - but I'm wondering if there really is a 30mm standard - or if that is a round-up euphemism for 28.6mm, just as "32mm" is for 31.8mm? http://www.chainreactioncycles.com/M...?ModelID=15692 I should have known that. Sorry I didn't check. ~PB |
#6
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What seat post clamp?
Pete Biggs wrote:
Sorry I don't know - but I'm wondering if there really is a 30mm standard - or if that is a round-up euphemism for 28.6mm, just as "32mm" is for 31.8mm? ~PB 30mm is the size for externaly butted steel seattubes -- /Marten info(apestaartje)m-gineering(punt)nl |
#7
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What seat post clamp?
On Sun, 17 Feb 2008 11:14:08 +0100, M-gineering
wrote: Pete Biggs wrote: Sorry I don't know - but I'm wondering if there really is a 30mm standard - or if that is a round-up euphemism for 28.6mm, just as "32mm" is for 31.8mm? ~PB 30mm is the size for externaly butted steel seattubes So 28.6 it is. Still, just to be on the safe side, I'll wait until tomorrow before ordering. |
#8
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What seat post clamp?
"Tom Crispin" wrote snip] The frame is described as 7005-T6. Can I tell from that if I should order a 30mm clamp or 28.6mm clamp? 7005 tells you what alloy the aluminium is, but I don't know the virtues of different alloys. My Grumman canoe is made our of 6061. T6 tells you how the alloy has been heat treated. My canoe is also T6. T6 canoes seem to cost a bit more than T4 canoes, but I don't know why. Anyway, it doesn't tell you about seat post diameters. Seat post diameters are really inch sizes. Thus 28.6 is really 1-1/8 inches, 30, 1-3/16 inches. "Zen and the Art of Motorcycle Maintenance" has a good section explaining that the best shim stock in the world for adapting sizes is made from old beer cans, but you have to scrape the picture off the beer can to maintain the bike's artistic purity Jeremy Parker |
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