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Mothyman
Joined: 25 May 2009
Posts: 491
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 Posted Wed Nov 4, 2009 5:51 pm |
hi all
when removing inner tube I noticed 3mm bulges on the tube in line with the spokes. The puncture was over one of these bulges and there was also a small hole in the 'lining' of the rim -in line with the spoke. I assumed the spokes were penetrating through to the tube but they seemed very sturdy on testing.
Any ideas?
These punctures also seem to happen when pumping the inner tube after a repair??
thanks
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kfinlay
Joined: 20 Sep 2009
Posts: 72
Location: Cardenden, Fife, Scotland
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Posted Wed Nov 4, 2009 6:01 pm |
are they old wheels with old rim tape? rim tape should stop this happening and even if they are new it may be poor quality rim tape so worth changing.
Kev
onwards and upwards . . . hopefully! |
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Mothyman
Joined: 25 May 2009
Posts: 491
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Posted Wed Nov 4, 2009 8:42 pm |
the bike was bought new 4months and about 200 miles ago...its my friend's Pinnacle carbon road bike. The rim tape looks ok but the innertubes looked 'old' with the bubble effect described above...maybe the new inner tubes wont have the problem..have replaced with Specialized ones
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Geoff_SS
Joined: 19 Dec 2007
Posts: 1045
Location: Derbyshire UK
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Posted Wed Nov 4, 2009 8:49 pm |
If the rim tape is the thin rubbery stuff then you're likely to get the effect you mention. I use Velox rim tape which is stiff and quite thick. However it can make tyre fitting difficult if the tyre is a tight fit but it's reliable. I don't think a new inner tube will make any difference.
However, unless it's causing actual punctures, it's unlikely to be a problem.
Geoff
Old cyclists never die; they just fit smaller chainrings ... and pedal faster |
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MattC59
Joined: 23 Jul 2007
Posts: 157
Location: Second star to the right and straight on till morning
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Posted Thu Nov 5, 2009 8:44 am |
Try the 'Stans' yellow rim tape. It's very thin, fiber reinforced and very tough. You can use it on it's own to seal rims if you're doing a tubless conversion, so it's plenty tough enough to stay in place under the high pressures of a road tyre and inner tube. I think I've got the standard Universal tape (12mm wide) in my rims. I've used two overlapping layers and it's still thinner than standard rim tape, so you get that little bit extra space to get your tyres on.
Have a look at this.......
http://www.notubes.com/tubeless_system.php?cPath=21_61
Cheers...... Matt
When I am grown-up I will understand how BEAUTIFUL it feels to administrate my life effectively. Until then I will continue to TORCH all correspondence that bores me and to DANCE NAKED over the remnants of its still glowing embers. |
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Mothyman
Joined: 25 May 2009
Posts: 491
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Posted Thu Nov 5, 2009 5:57 pm |
thanks lads
its a noob question, but what purpose does rim tape actually serve? something smooth for the tube to fit onto presumably - or is it for added strength?
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ride_whenever
Joined: 17 Oct 2006
Posts: 8281
Location: United Kingdom
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Posted Thu Nov 5, 2009 6:08 pm |
i use duck tape...
it protects the tube from the spokes and the nipple holes on the inside.
----------------------------------------------
456!
silly little bike |
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dennisn
Joined: 13 Sep 2007
Posts: 4138
Location: Toledo, Ohio USA
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Posted Thu Nov 5, 2009 6:25 pm |
| Mothyman wrote: | thanks lads
its a noob question, but what purpose does rim tape actually serve? something smooth for the tube to fit onto presumably - or is it for added strength? |
If you didn't use rim tape at all you would probably get a flat as soon, or shortly after,
you pumped it up. Rim tape protects the tube from touching the spoke and nipple. Without tape the tube will expand into the spoke hole and the constant rubbing and extra stress on the tube, as it fills the hole, will result in "air loss". 
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