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Nuts on inner tubes
Matt_Harrington:
Ken, I was wondering why there should be a gap between the rim and 1st nut.
Trigger:
On a new tube the first nut is tight and the second nut is just threaded on. This indicates that one nut on the inside and one on the outside. Also on some new tubes the first nut has a blob of thread lock on the thread ;)
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Seabeowner:
Always both out locked together. Both the wheels on my 500 on original tyres (although I have no proof they didn't both have a punctures in their 4000 miles) have both out.
Seabeowner:
--- Quote from: Matt_Harrington on October 01, 2023, 09:50:36 AM ---Ken, I was wondering why there should be a gap between the rim and 1st nut.
--- End quote ---
Always thought was that you could see if the tube is moving, the valve will tilt. Saves waiting until it tears itself apart.
AshimotoK0:
A guy got this back from Michelin
I sent my questions, as written at the beginning of this post, by email to Michelin UK in Stoke-on-Trent. I received the following reply from Tony Charlton, Technical Manager at Michelin.
"The inner tube is installed with the conical washer sitting between the inner tube and wheel rim. On a road bike the first lock nut should then be run down to lightly touch the rim, and then backed off by half a turn. The second lock nut is run down until it meets the first one, then the two nuts should be locked together by using spanners to rotate them in opposite directions.
For off road inner tubes being used at low tyre pressures there is a possibility of tyre creep, and the inner tube could be pulled around slightly with the tyre. If the inner tube is bolted to the rim the valve can be ripped out. If the lock nuts are raised further towards the valve cap then inner tube has some leeway to move before this happens. Any movement is thus obvious as the valve stem will no longer be straight and pointing at the centre of the hub, but will be pulled round at an angle by the tyre and can then be seen and corrected."
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