RJS1982 Posted December 8, 2014 Report Share Posted December 8, 2014 I need to buy four new tyres for my discovery 3. Currently have 235/70/R17 with load rating 111 and speed H Continental 4x4 contacts. Planning to buy some 50/50 on/off roads, like Grabber ATs, but options seem to be 235/65/R17. Is there any problems with putting 65 rather than 70 on to your car? Thanks, Ruaraidh Quote Link to comment Share on other sites More sharing options...
Xr1200 Posted December 8, 2014 Report Share Posted December 8, 2014 (edited) You get more ground Clarence with a 70 but a 65 won't roll as much in the corners Edited December 8, 2014 by Xr1200 Quote Link to comment Share on other sites More sharing options...
birdsallpl Posted December 8, 2014 Report Share Posted December 8, 2014 It just means your wheel and tyre diameter will be slightly smaller (10mm) and will marginally affect everything related, but so minor I don't think you will notice Quote Link to comment Share on other sites More sharing options...
RJS1982 Posted December 10, 2014 Author Report Share Posted December 10, 2014 Thanks for the responses guys. Will it reduce the fuel economy due to a smaller tyre having to turn more to maintain the same speed? Quote Link to comment Share on other sites More sharing options...
Albert 888 Posted December 10, 2014 Report Share Posted December 10, 2014 Have a look at cooper at3 tyres,put some on my disco 1 they are over size compared to the old ones,235/75/16 originals are 215/70/16,they are excellent, we do some serious off roading as in pay and play days and some tough north wales Green lanes,they are also great on the road and if not thrashed they will do 50000 miles if turned . If you Google tyre size calculator it will give you all need to know as in rolling diameter tyre hight and so on. Quote Link to comment Share on other sites More sharing options...
Fisherman Mike Posted December 11, 2014 Report Share Posted December 11, 2014 The main effect will be related to the smaller rolling diameter of the Tyre and will effect the speedometer/odometer reading.On modern vehicles it could also adversely affect the fine tolerances on the steering geometry but on heap of **** like a disco it shouldn't be a problem. Quote Link to comment Share on other sites More sharing options...
jonny thomas Posted December 16, 2014 Report Share Posted December 16, 2014 You can change the tyre size ok but it changes the rolling radius so you must change all 4 On constant 4 wheel drives or you will wind the centre diff right up Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.