While increasing tyre diameter to change gearing, ground clearance etc is reasonable, you need to be aware of the downsides of increasing width of tyres. There are two issues - the first one is that Series 1 do not have power steering!
The second one is that significant bits of the steering linkage were upgraded in Series 2/3 production, made necessary in part by the increasing use of wider tyres. I became aware of this many years ago when the bottom steering relay arm broke on my early 2a near Pimba. The replacement arm (which was in stock!) I got in Alice Springs was a lot heavier. And I have noticed the difference with Series 2a/3 from 1/2 at various gatherings. This was probably also a reason for dropping the bored shaft in the relay during Series 2 production - at least one person on this forum has reported having one break. Most Series 1 would still have the original relay shaft.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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