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Thread pitch for a bolt question....


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Had spare tyre base plate regalvanized. Now threads need to be chased with a tap. Just the larger tyre clamp nut on bottom of base plate. Can someone tell me the thread pitch? Assuming is Whitworth? Am in Houston,Texas and if someone here in the USA has a tap would loan me,i'll pay all shipping.


Ryan Holder

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There are two types of bonnet spare wheel mount, one is a circular plate with two tapped holes IN it.

The other is a rectangular plate with three threaded studs welded ON it.

I can't reconcile these characteristics with your "the larger tyre clamp nut on bottom of base plate.".

Can you clarify which style you have please?

Or perhaps the style on your vehicle is different again?

I attach a pdf showing the standard options.


Sp Wheel B'nt Mnts.pdf

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  • 2 weeks later...


Couldn't find a tap at a fair price here in States. Started looking online and found Tracy Tools in Barton Hill Way. Cost £3 plus £10 shipping and had in Houston,Texas in 8 days. Very nice. Will use again.

Thanks for all the help. This board has been very helpful for a Landy lover on the other side of the pond.


PS. Just got my 2nd 88 today from South Africa. More questions to follow.

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