tups93 Posted June 24, 2009 Share Posted June 24, 2009 hey all, im going to be putting 285/75R16 on my 110 hi cap defender and im wondering if i will have to do anything to my speedo? the tyres that were on it were 7.50R16 cheers Quote Link to comment Share on other sites More sharing options...
western Posted June 24, 2009 Share Posted June 24, 2009 should be OK with the existing speedo drive gear in the transfer box, you can remove it to check the colour of the gear it should be blue, which is correct for 110 on 7.50 or 235 or 255 tyres. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted June 25, 2009 Share Posted June 25, 2009 Every Defender I've been in read quite high on the speedo and larger tyres makes it more accurate. Quote Link to comment Share on other sites More sharing options...
BogMonster Posted June 25, 2009 Share Posted June 25, 2009 Every Defender I've been in read quite high on the speedo and larger tyres makes it more accurate. By law they have to over read by somewhere between 0 to 10 percent so most manufacturers aim somewhere in the middle - newer vehicles are usually out by about 5% older ones with the mechanical speedo tend to be more. Worst I have seen was 25% but that was a 110 on 205s 33" tyres instead of 32" tyres will increase the gearing by about 3% so will probably cut the speedo error in half, more or less, so it will still read slightly over. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted June 25, 2009 Share Posted June 25, 2009 This is why I got a VDO. $75 and I can program it with whatever tyres I run. Calibrated to within 0.1%. Quote Link to comment Share on other sites More sharing options...
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