Bike Forums - View Single Post - Too wide presta valve?

06-18-13 | 07:42 AM

#11

FBinNY

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Joined: Apr 2009

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From: New Rochelle, NY

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Quote:

Originally Posted by Looigi

There is one concern. If the base around the stem doesn't sit flush down against the rim, the adjacent portion of the tube can bulge into the space between the rim and the valve base and fail.

+1, the wider base flange of the older design PVs didn't allow the valve to settle low enough leaving a gap that the tube ballooned into often splitting or overexpanding and leaking.

The tubes sold today, have a redesigned, bonded in valve with virtually no base flange. They were designed to solve the problem caused by the narrow 700x rims in vogue today.

So go ahead and try your tubes, and you might be OK, but is you develop leaks near the the valve, you know why and need to buy a more modern tube.

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