Nearest match to original size tyres???
Discussion
I found my car a bit "fussy" on the motorway with 165Rs on it. They have a smaller rolling radius than the crossplys the car was designed for even though they were a factory oprion. The 70 sections mentioned above have been used for years on MGBs, but I run mine on standard (ie 82 section not low profile) 175 radials. They give close to the 22 MPH/1000RPM design gearing in o/d top. They give plenty of grip but can be unstuck with a lot of right boot. I also never complain about heavy steering at low speeds. This has been done to death on the MGB BBS on Britishcars.org for years.
you might find this page (and the other pages) useful, see halfway down for calculator - http://www.carbibles.com/tyre_bible_pg4.html
and this page halfway down for aspect ratio - http://www.carbibles.com/tyre_bible.html
and this page halfway down for aspect ratio - http://www.carbibles.com/tyre_bible.html
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