marc sinclair

New Member
hi everyone, i´m new to landrovers and the forum so please go easy on me for asking dumb questions!!
my 1975 swb series 3 has 16" rims and 7.5 16 tyres but they are all nearly shot so need to be replaced. i have 2 205 16 ats in the garage, should i buy four 7.5´s or buy two 205´s how will this affect the gearing? i dont have overdrive but am considering it or perhaps range rover diff´s? which tyre size suits which combination? now is probably a good time to mention my landy has it´s origional but fresh 3 brg motor is she is now on 7.5´s she revs her buns off at 45!! many many thanks for your tipps,

marc, nyhammar,Sweden.
 
hi everyone, i´m new to landrovers and the forum so please go easy on me for asking dumb questions!!
my 1975 swb series 3 has 16" rims and 7.5 16 tyres but they are all nearly shot so need to be replaced. i have 2 205 16 ats in the garage, should i buy four 7.5´s or buy two 205´s how will this affect the gearing? i dont have overdrive but am considering it or perhaps range rover diff´s? which tyre size suits which combination? now is probably a good time to mention my landy has it´s origional but fresh 3 brg motor is she is now on 7.5´s she revs her buns off at 45!! many many thanks for your tipps,

marc, nyhammar,Sweden.

205 tells us the width but not the height of the tyre for that we need to know the profile 205/65 205/75 etc. as this 2nd number is the height as a percentage of the width of the tyre. once that is known then you can calculate the overall diametre of the wheel & tyre.
 
205 tells us the width but not the height of the tyre for that we need to know the profile 205/65 205/75 etc. as this 2nd number is the height as a percentage of the width of the tyre. once that is known then you can calculate the overall diametre of the wheel & tyre.

Jack it up and run an inch-tape round the tread.

Find out how many inches all the way round the middle.

Divide 63,360 by your tyre circumference in inches to get the number of TYRE revolutions per mile.

This information won't do you any good. Bigger diameter tyres and / or an overdrive would.

CharlesY
 
ere Charlesy - that dont take into account compression of the tyre with the weight of the vehicle - it is Rolling circumference yu would need.
 

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