Landie speedos tend to overread by quite a bit IME. I run 33" tyres (1" larger) on both my landies, and the speedos are pretty close now (but still overread slightly).
Not sure if this is of any help...
http://www.dur.ac.uk/p.d.kuhlmann/speedo.pdf
Regards,
Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C, Suzuki SV650
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