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Are all Schraeder valves the same?

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andy120t:
I found a 550 wheel/ tyre without a valve, so I took one from a brand new mountain bike tyre and popped it in. It fits and seems to be holding air .....I assume they are all built to the same standard so no reason for a bicycle one not to work on motorbike. Pressure is probably similar.

Any thoughts gratefully received!

McCabe-Thiele (Ted):
IIRC some cycle tyres have higher tyres pressures than cars.

Mr Google says 50-70 psi on road bikes some even higher!

Johnwebley:
I seem to remember the inner was two lengths

Standard about 20mm

Short about 13mm

The shorter were for high speed,

The centre being less likely to lift at high speed,



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K2-K6:

--- Quote from: McCabe-Thiele (Ted) on March 25, 2024, 06:33:40 PM ---IIRC some cycle tyres have higher tyres pressures than cars.

Mr Google says 50-70 psi on road bikes some even higher!

--- End quote ---

Most of the high pressure cycle are "Presta" type valves, with screw collar to lock them closed, can be up to 120 psi.  I prefer the Schrader type for ease of compatability during inflation,  but some rims are Presta only, so forced choice.

Schrader will have no problem up even around 60 psi though, no difference to car type in manufacture as far as I know, so completely interchangeable in reality.

Thought it's centrifugal as John's  post related.  Release of air at very high speed the risk, but way out of general road bike usage range. Metal caps with rubber disc inside to positively close off a contingency.

andy120t:
Thanks for the thoughts. It's holding air happily, as I would expect - and I think the pressures are lower than my mountain bike which is 36-38psi,(from memory). Valve cap is on too, so I'll sleep easily now,!

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