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Thanks all. The belt feels very loose, easy to move it across the sprocket by hand. No obvious wear on the tyre from the belt. I only did a few kms like that though. Dealer visit time.

I have had a similar experience. Does anybody know what size the castellated nut is to release the rear axle?? By my measure i get 36mm but Parts book says M30 ?

Normally nut and bolt sizes are given by the size of the thread, so M30 in the parts book probably refers to the thread size - but in that case I would expect 45 - 46mm across flats?

From previous tinkering i had one of these watched on Ebay, i have one on order now so will confirm once received that it does fit.

http://www.ebay.co.uk/itm/110839470039?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

If I remember correctly, 1-7/16" fits perfectly but 1-1/2" will do. At the moment I am a very long way from my three wheeler and toolkit so can't check for a week or two. And yes, I expected metric spanners to fit better too!

Right, 1-7/16" spanner size equates to 36mm spanner size, although inch and a half is a smidgen more.

A 36mm spanner sized nut should equate to an M24 thread size, or roughly an inch in old money.

An M30 thread should use a 46mm spanner size.

Some good back pocket info HERE which I think is pretty accurate in effort.

Is this any use? Who knows, my car's a long way from me too as I write..

Now that PDF really IS useful Steve - thanks!

Thanks for the metric bolt info, nice and easy to refer to.

Brings me nicely into:
I'd like to change the stock bolts on the rear coil overs to stainless. However I've always been told that stainless is too brittle and high tensile is better. Fact or myth. Bit of both i would imagine?

Matty, I believe what you've been told is correct. It IS possible to get high tensile stainless, but it's very specialised stuff I understand.

I recall reading about someone who made his motorcycle front axle out of the wrong stainless grade & suffered a metal fracture.