Has anyone bought a replacement monowheel inner tube recently that fits
properly?
After reading reports on this forum about inner tube blow - outs, given that
mine is now over 7 years old, I thought I had better fit a new inner tube -
so I purchased one from Europa and tried to fit it yesterday. Unfortunately,
I found that the cranked valve stem didn't fit the wheel hub. Given the
shape of the hub casting, the stem would be forced outwards on inflation and
the threaded part of the stem would be forced hard into contact with the
outer rim - making it difficult, or impossible, to fit a pump connector to
it.
On closer examination I found that the outside of the cranked stem on the
original tube was 20mm from the surface and the replacement stem was 25mm
---From the surface. Given that the original didn't appear in too bad
condition, I refitted it and am now looking to find an exact replacement.
The curious thing is that, when I queried this with the factory, Roger told
me that mine was the last one of a batch of at least 6 and there had been no
other complaints! Yet I am sure that, if I had forced the tube into service,
I would be risking a blow out due to an over-stressed valve stem
neck/innertube joint. Has anyone had a similar experience and could this be
the cause of the recently mentioned blow - outs?
More to the point, does anyone know of a source of 8.00-6 inner tubes with a
cranked stem (the outer edge of the crank being 20mm from the tube surface)
please?
Regards
Roger Mills
G-BVUV
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