How do you call this thingy?

[Lockheed]

I just pun**ed my tyre. Did not have a closer look yet, as it is too late for it today, but there is a chance it was because I was using presta valve tube on shrader rim.
Whatever the reason, I think it'd be better if sort this rim thing out.
How do you call this thing that you put on Presta valve so that you can put it on a rim previously used with Schrader valve?
I have no idea what to search ebay for.

 

[hubgearfreak]

if that's what's done it, you'll have to buy a new tube, so why not buy the correct one for the rim?

if there's a reason...maybe this is what you're after?

http://www.unicycle.uk.com/shop/shopdisplayproduct.asp?catalogid=779

 

[Lockheed]

if that's what's done it, you'll have to buy a new tube,

I know, but it's hard to find a good slim high-pressure tube with Shrader valve. Besides, I like presta better.

Thanks for the name. Now I'm onto something!

 

[threefingerjoe]

this is the one http://www.unicycle.uk.com/shop/shopdisplayproducts.asp?search=yes

That other one just looks like a regular rubber grommet for protecting a wire that passes through sheet metal. If you want to use those, you can probably find them in any auto parts store.

 

[Rhythm Thief]

Is there a difference between Presta and Schraeder rims? I had no idea ... that might explain why Ms RT's mountain bike keeps eating rear tubes.

 

[gavintc]

It is the hole size. If you put a road tube in a mountain bike rim, the thing will not fit correctly and you stand a chance of getting a puncture.

 

[spence]

(Some) Mavic rims come with a valve adapter, small plastic plug thing to reduce the schrader (8.5mm) hole down to a presta one. Check to see if they're availiable seperatly.

 

[Lockheed]

this is the one http://www.unicycle.uk.com/shop/shopdisplayproducts.asp?search=yes

The link does not work.

 

[ianrauk]

I call it a rubber valve gromit. just pop into your LBS they will probably have a few lying about and will just give you a couple.

 

[ufkacbln]

Schwalbe come with a retaining ring that is reversible, one side is able to screw down the thread and fit the Schraeder hole. Centralises the valve and stops the wear around the valve hole.

 

[arallsopp]

Schwalbe come with a retaining ring that is reversible, one side is able to screw down the thread and fit the Schraeder hole. Centralises the valve and stops the wear around the valve hole.

ooh! Ringed Schwalbes on all my bikes and I never knew that! Thanks!

 

[arallsopp]

...and no sooner do I hear of its existence, I find one at spa for 50p.
http://www.spacycles.co.uk/products.php?plid=m2b0s123p1765