At 9:15 PM +0100 10/16/01, Richard Notton wrote:
>Nowhere near as dangerous as the split ring devices, plus you can do a tyre
>change in the field without the histrionics of safety cages, chains and the
>like. The main danger is for the colour-blind who cannot recognise the red
>nuts. The CMP vehicles produced to WD requirements are also bolted, two
>piece rims.
My roommate mentioned the use of cages and everything for the
changing of these types safely. I think there may be a slight
difference.
>The issues seem to be the ease of handling, I have personally removed and
>re-fitted several 14.00 x 20 non-runflat on bolted rims and they are so
>easy, the larger sizes have proportionally more leeway and just fall off the
>rim with minimal persuasion. The only trouble is the sheer size and weight
>of the tyre, dropping it squarely onto the back rim is awkward single-handed
>and lifting the assembled wheel to vertical isn't easy.
Yeah, lots less easy than my nice 17" motorbike wheels.
> > It would seem that if your bolts are in good shape and torqued down
>> right you should be fine. Add to that the fact that if you don't
>> inflate the wheel with the bolts missing you should never really have
>> a problem (aside from separating a wheel that didn't want to separate
>> the bead from the wheel...).
>>
>The bolts are actually retained studs and even with several missing, but not
>adjacent, the rim will hold.
So the studs are on the back rim half and protrude through the front
rim half. Do the wheel studs locate through both rim sets and act as
an additional strengthening/retaining component?
>The main reason for the two-piece rim is the Army use of run-flat tyres, you
>will notice a Ferret, for instance, has the nomenclature R.F.H.S.2. moulded
>in the side wall. Picking an unmounted tyre up it immediately becomes
>obvious that the tyre is exceedingly heavy for a smallish 9.00 x 16, the
>side walls are 1 1/2" thick to the tread. There is a very thick bead
>spreader fitted being several inches thick of hard rubber like a giant flap
>that stops the beads moving from the rim and a smaller than normal tube is
>fitted owing to the volume taken up by the exceedingly thick side walls and
>spreader. You may well find most Ferrets driving around on 0 - 10 psi
>actually in the tube.
mmmmmm, runflat tires....
Do they have beadlocks inside the tire or is this just an additional
section on the sidewall that wraps around the edge of the rim?
>The two piece bolted rim is about the only way these runflat tyres can be
>fitted as the spreader has to be compressed slightly, the British military
>seems to have standardised on them for all wheels on specialised or combat
>vehicles from before 1939 to the present.
Likely it makes it easier to pull the tire off the rim once you've
deflated the monster and removed the bolts (and broken the bead..)....
-- -- ---------------------------------------------------------------- - Ryan Montieth Gill ---------- SW1025 H - - Internet Technologies -- Data Center Manager (3N &10S) - - ryan.gill@turner.com rmgill@mindspring.com - - www.mindspring.com/~rmgill - - I speak not for CNN, nor they for me - ---------------------------------------------------------------- - C&R-FFL - \ Protect Freedom AND Security - - NRA \ http://www.indefenseoffreedom.org/ - ----------------------------------------------------------------
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