How bad? Running Presta in Shreda

[Trikeyohreilly]

Please pardon my spelling. Can't spell dyslexic either.

Can you perceive a problem running a Presta innertube in a rim designed for a shreda valve?

If it makes any difference, it in a 20 (406) rim.

I know you can get an adjuster to change the diameter or the valve hole but I dont have one available right now.

Sorry if this has been answered before (sure it has) but couldn't find it in the search.

Thank you

[peetee]

Some presta inner tubes come with a valve stem threaded collar that has a shoulder that fits neatly in a schrada sized rim hole. The enclosed photo shows the upper collar as the correct one - although it should be the other way round. With one of these and tube fitted properly with the valve perpendicular to the hole you should be fine.

[Jdsk]

I wouldn't choose to. As you've said adaptor grommets are available.

If I had to fit one and didn't have a grommet or collar then I'd make something out of rubber sheet, such as a tube or a thin-walled tyre.

Off to check the archives... some suggestions that you can use a valve dust cap as an adaptor...

Jonathan

[Ugly]

Rim grommets available from unicycle.com at the grand price of 55p each. Type in 'schrada to presta rim adapter' in your search engine.

[Jdsk]

It's Schrader. Although those clever search engines will probably find the information regardless.

Jonathan

[backnotes]

I can post you a couple of the Continental ones from the bottom of my saddlebag if you PM me your address.

[tenbikes]

Unless you are running low pressures when you might get some tube rotation in the tyre, it won't matter one jot....