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#1
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Carbon steerer problems... eek do I need a new fork?
Hi
Well, i have a nice Look HSC5 SL all carbon forks - beautiful.... Except, a while ago, they came a bit loose in my integrated headtube. Now, I think i probably made a few errors from here on: Firstly, it seemed to me that I couldn't get the cap tight enough to get rid of all the play before the expander started moving in the steerer. So, i purchased another bung... Now, I didn't really appreciate that a major part of the bung is the expand not just to grip the inside of the steerer so one can tighten the cap and remove play, but also to re-enforce the inside of the steerer around where the stem sits to stop damage caused by overtightening the stem. So, stupidly had the bung too far dow the steerer (slightly below the bottom of the stem), so when I tightened the stem, the top of the two bolts just kept tightening. So, now, when I take the stem off and look at the top of the steerer, I can see that I've sort of dented and slightly squashed the top of the steerer. So, I think I've partially rectified the problem by getting a bung that grips right at the top of the steerer, within the boundaries of the stem, but it's left me worried - I've almost certainly weakened the top of my steerer. I have a long stem anyhow - three 1cm spacers above the headtube, but I really don't want to cut the steerer down by one of these spacers (i.e. potentially to a less damaged part of the steerer), because it will be too low for me. I've tried to test how strong the stem/steerer join is by gripping the handlebars when the bike's stationary and putting pressure on the join (more pressure than I would imagine in normal use), and it all seems strong. It's an awkward one - a new pair of forks is about £230, which I'd much rather not spend... but I don't want to have my bars break off at 30mph either Well, advice would be most appreciated, Many thanks, Mark. |
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#2
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Carbon steerer problems... eek do I need a new fork?
in message .com, Mark
') wrote: Well, i have a nice Look HSC5 SL all carbon forks - beautiful.... So, now, when I take the stem off and look at the top of the steerer, I can see that I've sort of dented and slightly squashed the top of the steerer. So, I think I've partially rectified the problem by getting a bung that grips right at the top of the steerer, within the boundaries of the stem, but it's left me worried - I've almost certainly weakened the top of my steerer. It's an awkward one - a new pair of forks is about £230, which I'd much rather not spend... but I don't want to have my bars break off at 30mph either Well, advice would be most appreciated, I would seek advice directly from Look - they have a reputation of being approachable and helpful, although I haven't dealt with them personally. I expect getting your letter or email translated into French might help! -- (Simon Brooke) http://www.jasmine.org.uk/~simon/ ((DoctorWho)ChristopherEccleston).act(); uk.co.bbc.TypecastException: actor does not want to be typecast. [adapted from autofile on /., 31/03/05] |
#3
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Carbon steerer problems... eek do I need a new fork?
I've tried to test how strong the stem/steerer join is by gripping the
handlebars when the bike's stationary and putting pressure on the join (more pressure than I would imagine in normal use), and it all seems strong. Is it just the top of the steerer that's damaged? If so I can't see that causing a problem further down the steerer. I'm just some bloke on Usenet thobut, and I won't be riding it at 30+mph It's an awkward one - a new pair of forks is about £230, which I'd much rather not spend... but I don't want to have my bars break off at 30mph either They'd look pretty mounted on a wall or, if it's a 1" steerer, I'll give you a tenner for 'em - I'm riding on an 11 year old carbon frame and my friends think it's only a matter of time before the entire thing disintegrates beneath me - a dodgy fork won't worsen the odds too much :-/ |
#4
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Carbon steerer problems... eek do I need a new fork?
On 4 Aug, 20:46, Mark
pleasegivegenerously@warmail*turn_up_the_heat_to_ reply*.com.invalid wrote: I've tried to test how strong the stem/steerer join is by gripping the handlebars when the bike's stationary and putting pressure on the join (more pressure than I would imagine in normal use), and it all seems strong. Is it just the top of the steerer that's damaged? If so I can't see that causing a problem further down the steerer. I'm just some bloke on Usenet thobut, and I won't be riding it at 30+mph It's an awkward one - a new pair of forks is about £230, which I'd much rather not spend... but I don't want to have my bars break off at 30mph either They'd look pretty mounted on a wall or, if it's a 1" steerer, I'll give you a tenner for 'em - I'm riding on an 11 year old carbon frame and my friends think it's only a matter of time before the entire thing disintegrates beneath me - a dodgy fork won't worsen the odds too much :-/ Ha ha guess you've gotta have a good sense of humour to be riding a 11 year old carbon frame |
#5
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Carbon steerer problems... eek do I need a new fork?
in message . com, Mark
') wrote: On 4 Aug, 20:46, Mark pleasegivegenerously@warmail*turn_up_the_heat_to_ reply*.com.invalid wrote: I've tried to test how strong the stem/steerer join is by gripping the handlebars when the bike's stationary and putting pressure on the join (more pressure than I would imagine in normal use), and it all seems strong. Is it just the top of the steerer that's damaged? If so I can't see that causing a problem further down the steerer. I'm just some bloke on Usenet thobut, and I won't be riding it at 30+mph It's an awkward one - a new pair of forks is about £230, which I'd much rather not spend... but I don't want to have my bars break off at 30mph either They'd look pretty mounted on a wall or, if it's a 1" steerer, I'll give you a tenner for 'em - I'm riding on an 11 year old carbon frame and my friends think it's only a matter of time before the entire thing disintegrates beneath me - a dodgy fork won't worsen the odds too much :-/ Ha ha guess you've gotta have a good sense of humour to be riding a 11 year old carbon frame Why? Would you have a problem flying on an eleven year old carbon fibre aeroplane? If so, you'd better not fly; all modern airliners use significant elements of carbon fibre in their structure. If not, why do you think structural failure on a pushbike is more serious than structural failure on an aeroplane? -- (Simon Brooke) http://www.jasmine.org.uk/~simon/ ;; If you're doing this for fun, do what seems fun. If you're ;; doing it for money, stop now. ;; Rainer Deyke |
#6
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Carbon steerer problems... eek do I need a new fork?
Simon Brooke wrote:
Why? Would you have a problem flying on an eleven year old carbon fibre aeroplane? If so, you'd better not fly; all modern airliners use significant elements of carbon fibre in their structure. If not, why do you think structural failure on a pushbike is more serious than structural failure on an aeroplane? I wouldn't want to be close to an aeroplane built by 'bicycle engineers '*) let alone fly in one *) all QC performed by the paying customer -- /Marten info(apestaartje)m-gineering(punt)nl |
#7
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Carbon steerer problems... eek do I need a new fork?
M-gineering wrote:
*) all QC performed by the paying customer a bit like aeroplanes then :-) or pressure vessels :-) or (topical) bridges.... although mostly in the distant past. T |
#8
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Carbon steerer problems... eek do I need a new fork?
Mark wrote:
On 4 Aug, 20:46, Mark pleasegivegenerously@warmail*turn_up_the_heat_to_ reply*.com.invalid wrote: I've tried to test how strong the stem/steerer join is by gripping the handlebars when the bike's stationary and putting pressure on the join (more pressure than I would imagine in normal use), and it all seems strong. Is it just the top of the steerer that's damaged? If so I can't see that causing a problem further down the steerer. I'm just some bloke on Usenet thobut, and I won't be riding it at 30+mph It's an awkward one - a new pair of forks is about £230, which I'd much rather not spend... but I don't want to have my bars break off at 30mph either They'd look pretty mounted on a wall or, if it's a 1" steerer, I'll give you a tenner for 'em - I'm riding on an 11 year old carbon frame and my friends think it's only a matter of time before the entire thing disintegrates beneath me - a dodgy fork won't worsen the odds too much :-/ Ha ha guess you've gotta have a good sense of humour to be riding a 11 year old carbon frame i think i'd be more worried by a alui frame though probably not enought to to ride it. as simon says planes use carbon, and they normally have long working lives. i don't think that carbon gets fractued like alu does so it shouldn't degrade in that way though it doesn't like impacts nor sun i'd guess. roger -- www.rogermerriman.com |
#9
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Carbon steerer problems... eek do I need a new fork?
i don't think that carbon gets fractued like alu does so it shouldn't
degrade in that way though it doesn't like impacts nor sun i'd guess. I forgot to mention the crash damage... |
#10
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Carbon steerer problems... eek do I need a new fork?
On 5 Aug, 13:00, Simon Brooke wrote:
in message . com, Mark ') wrote: On 4 Aug, 20:46, Mark pleasegivegenerously@warmail*turn_up_the_heat_to_ reply*.com.invalid wrote: I've tried to test how strong the stem/steerer join is by gripping the handlebars when the bike's stationary and putting pressure on the join (more pressure than I would imagine in normal use), and it all seems strong. Is it just the top of the steerer that's damaged? If so I can't see that causing a problem further down the steerer. I'm just some bloke on Usenet thobut, and I won't be riding it at 30+mph It's an awkward one - a new pair of forks is about £230, which I'd much rather not spend... but I don't want to have my bars break off at 30mph either They'd look pretty mounted on a wall or, if it's a 1" steerer, I'll give you a tenner for 'em - I'm riding on an 11 year old carbon frame and my friends think it's only a matter of time before the entire thing disintegrates beneath me - a dodgy fork won't worsen the odds too much :-/ Ha ha guess you've gotta have a good sense of humour to be riding a 11 year old carbon frame Why? Would you have a problem flying on an eleven year old carbon fibre aeroplane? If so, you'd better not fly; all modern airliners use significant elements of carbon fibre in their structure. If not, why do you think structural failure on a pushbike is more serious than structural failure on an aeroplane? -- (Simon Brooke)http://www.jasmine.org.uk/~simon/ ;; If you're doing this for fun, do what seems fun. If you're ;; doing it for money, stop now. ;; Rainer Deyke Oh, i don't have a clue actually. remember I'm the bloke that may just have screwed up his £230 forks... and my frame is Titanium made by Omega - would be pleasantly suprised if i was still able to ride it in 11 years - although by that point, they'll probably be back in business again, so I can take advantage of my lifetime guarantee when it falls apart on me. Oh, and yes I have serious problems flying in any planes, but that's another story. |
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