russdy Posted October 29, 2013 Report Share Posted October 29, 2013 as above i know this may be a daft question but if i want to change my tyres from 215/65/17 for some all terrain tyres do they need to be the exact same or can i change for a larger size ? cheers Quote Link to comment Share on other sites More sharing options...
sitsinhedges Posted October 29, 2013 Report Share Posted October 29, 2013 I changed my Jimny tyres for bigger ones on the same rims they just need to fit within the wheel arch without fouling I think. Always wondered how much it affected the speedo though? Quote Link to comment Share on other sites More sharing options...
fruity Posted October 29, 2013 Report Share Posted October 29, 2013 I changed my Jimny tyres for bigger ones on the same rims they just need to fit within the wheel arch without fouling I think. Always wondered how much it affected the speedo though? I've always wondered that, especially when you see 4+4's with stupidly huge tyres fitted I suppose you could check with a satnav ? Be interesting to see if there were much difference Quote Link to comment Share on other sites More sharing options...
ferguson_tom Posted October 29, 2013 Report Share Posted October 29, 2013 yer you can change them no problem just make sure load and speed rating are up to the manufacturers spec. Most speedos read well under anyway so wont make much difference to what your speedos says. Quote Link to comment Share on other sites More sharing options...
four-wheel-drive Posted October 29, 2013 Report Share Posted October 29, 2013 First you need to find out what is the largest tyres that will fit your car/truck just ask on an owners forum they will tell you then you can put the sizes in to this forum page and it will tell you how much they will affect your speedo. http://www.4x4tyres.co.uk/4x4_tyre_size_tool.php?osCsid=igasl0vpe5viqnb8mmp9la2716 Quote Link to comment Share on other sites More sharing options...
utectok Posted October 29, 2013 Report Share Posted October 29, 2013 I was told it is illegal to change the tyre spec. And if u crash ur insurance may not be valid. Also the tyre width must be inside the bodywork for mot. Slightly narrower or wider is ok but that's about it my garage said Quote Link to comment Share on other sites More sharing options...
russdy Posted October 30, 2013 Author Report Share Posted October 30, 2013 So the tyres on now say 215/65/17. If i was to go for some bf goodrich which 2 figures were diferant say 225/75/17 would they not fitt on the same rim. I dont really understand what the 2 figures beforr the 17 really mean. I know its width and wall height but im not sure about stright swapping Quote Link to comment Share on other sites More sharing options...
al4x Posted October 30, 2013 Report Share Posted October 30, 2013 The first is the width and the second the height of the tyre as a percentage of width. That's not a major difference so should be fine Quote Link to comment Share on other sites More sharing options...
sishyplops Posted October 30, 2013 Report Share Posted October 30, 2013 (edited) It's not enough to worry about , check with a tyre company, especially if they are going to be the supplier they will be more than happy to tell you what you can fit Edited October 30, 2013 by sishyplops Quote Link to comment Share on other sites More sharing options...
casts_by_fly Posted October 30, 2013 Report Share Posted October 30, 2013 what vehicle? Usually a change up in either width or profile is fine, but upping both can be a big swing. Changing both can be a fairly major change relative to the car it is on, not just for wheel arch but also steering arms and other suspension parts. My Jeep takes 225/70/15's. A change to a 245/65/16 works for height when you put it on, but it rubs on the inside of the tire when the suspension is compressed or at full lockup. And that is REDUCING the aspect ratio while going up. Going from a 215/65/17 to a 225/75/17 is a pretty big jump (2.5" in diameter so you really need to get onto a forum of owners for your car and check what the max size is that people have found to work. thanks,rick Quote Link to comment Share on other sites More sharing options...
four-wheel-drive Posted October 30, 2013 Report Share Posted October 30, 2013 My Vitara had 195/80/15 when I got it but all different makes and all worn so after some research I put a set of 215/75/15 General ATs on it I had to take the mud flaps off as they rubbed on full lock but the improvement in the ride was well worth it. Quote Link to comment Share on other sites More sharing options...
russdy Posted October 30, 2013 Author Report Share Posted October 30, 2013 It a nissan x-trail 2007 i was goin to swap the road tyres that was on for some all terrain but when ive looked on the net its hard to find a set with the same dimentions as the tyres already on Quote Link to comment Share on other sites More sharing options...
four-wheel-drive Posted October 30, 2013 Report Share Posted October 30, 2013 (edited) This is the place to look if you cannot find the size that you need just ask and someone will tell you. http://www.nissanforums.com/x-trail/ http://www.nissanforums.com/x-trail/170468-need-tire-recommendations.html Edited October 30, 2013 by four-wheel-drive Quote Link to comment Share on other sites More sharing options...
al4x Posted October 30, 2013 Report Share Posted October 30, 2013 what vehicle? Usually a change up in either width or profile is fine, but upping both can be a big swing. Changing both can be a fairly major change relative to the car it is on, not just for wheel arch but also steering arms and other suspension parts. My Jeep takes 225/70/15's. A change to a 245/65/16 works for height when you put it on, but it rubs on the inside of the tire when the suspension is compressed or at full lockup. And that is REDUCING the aspect ratio while going up. Going from a 215/65/17 to a 225/75/17 is a pretty big jump (2.5" in diameter so you really need to get onto a forum of owners for your car and check what the max size is that people have found to work. thanks, rick It's not a big radius change though which is what counts Quote Link to comment Share on other sites More sharing options...
Malik Posted October 30, 2013 Report Share Posted October 30, 2013 http://www.etyres.co.uk/tyre-size-calculator This might be useful to you. I am thinking of changing my l200 tyres from 245/65/17 to 265/70/17 as i am told this is the maximum size i can fit without lifting. That website gives you a good idea of the difference Quote Link to comment Share on other sites More sharing options...
Mentalmac Posted October 31, 2013 Report Share Posted October 31, 2013 I just changed my 265/70/16's to 265/75/16's and it still felt like a fair old jump and they just fit with enough clearance for full lock and all that. That's only the aspect ratio up by 5, but still feels quite a lot. Quote Link to comment Share on other sites More sharing options...
leadbreakfast Posted November 6, 2013 Report Share Posted November 6, 2013 I was told it is illegal to change the tyre spec. And if u crash ur insurance may not be valid. Also the tyre width must be inside the bodywork for mot. Slightly narrower or wider is ok but that's about it my garage said It's not illegal to change tyre size and any mod on your vehicle should be declared anyway. Try sticking with the same size as said above if you go to big you have to modify a lot. I went from 195/55/15 to 35/12.50/15 and had to change everything Quote Link to comment Share on other sites More sharing options...
vampire Posted November 6, 2013 Report Share Posted November 6, 2013 Have changed the tyres on two of the 4x4 i have owned and like you,i asked the question here and on 4x4 forum with varied answers,some very indepth replies and links etc. The only way be 100% in what you are doing and this is what i ended up doing, is to ask at your local tyre depot,they will look it up and will not fit a lot of the tyre sizes that will have been suggested on the internet,then i rang landrover main dealer and asked the workshop manager. Ended up with standard width for rim but higher side wall and opted for bfg,few pounds more and had to change all five,but bfg are stronger side walls etc than a lot of the rivals,have a look what your local farmers have fitted........bfg Quote Link to comment Share on other sites More sharing options...
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