muffking Posted January 20, 2007 Report Posted January 20, 2007 I've got standard 16"s on my Mk2 Ghia but went out and bought myself a lovely set of 18"s. The correct tyre size if using these on a normal car is 225/40/18 but I'm thinking of upping the wall size to 225/45/18 although this makes the diameter 1.6" taller, filling the arches a little more without going OTT. I'm aware of the speedo difference, but what size tyres do any of you 18" guys run ? Quote
AndeeeH Posted January 20, 2007 Report Posted January 20, 2007 Fords quote a tyre size of 235/45 Rx 18 for the 8x18's option on the new S-Max. Andy. Quote
El Dingo Posted January 20, 2007 Report Posted January 20, 2007 There's a useful chart here...http://www.dunlop.co.za/tyres_conversion.aspx Quote
El Dingo Posted January 20, 2007 Report Posted January 20, 2007 ...but I can't find 225/45R18 on that chart. Where did you buy your 18's from? Can you post a pic? I was going to buy a package of 17's and tyres soon, but the 18's might look better. Quote
muffking Posted January 22, 2007 Author Report Posted January 22, 2007 Cheers guys. I think the Dunlop site just shows what tyre size you can upgrade to while retaining the same rolling radius, but I'm looking to increase the rolling radius in order to fill a little more arch. It's interesteing to see Ford going to a 45% wall on 235mm tyres though, although my wheels are 7.5" wide which is supposed to take 225 with the absolute maximum being 235. I guess I just have to find a set, but wondered what any other 18" Mk1/2 owners had. Quote
mumof4 Posted January 22, 2007 Report Posted January 22, 2007 do you have to have diff size brakes if changing tyre size?..or am i being daft here? Quote
adrianf. Posted January 22, 2007 Report Posted January 22, 2007 I had a swt of 18" a while ago with 224/40/18.You are right in what you are saying about the arches,they do need filling a bit more.One answer would be to lower the suspension but that cost money.Just be carefull with that size of tyre as i couldnt find a set of reinforced/extra load tyres which is what the Gal needs.If you go up to a 45 profile you may find some Quote
steve67car Posted January 27, 2007 Report Posted January 27, 2007 i have 225 40 18 but if you go up a width size the wall size goes up as well as the 40 is a %age of the 225 so there fore 40= 40%of 225 :) :33: Quote
Guest Cepheus Posted January 27, 2007 Report Posted January 27, 2007 or am i being daft here? Yes Quote
malcolm.dobell Posted January 31, 2007 Report Posted January 31, 2007 seems to me that if you increase the overall diameter you might fill the wheel-arch better but on full lock you might actually hit the wheel arch. I have 225/45x17 on my Alhambra and there's precious little space between tyre and arch on full lock Quote
Marky Posted February 3, 2007 Report Posted February 3, 2007 Mine had 235/40/18's. Main reason is you can get these tyres at 95 rated reinforced a MUST for the Shalaxy. You will not get 225/40/18's reinforced...nobody makes them !!!! If you want to fill the arches get yorself to the dealers, order a eibach pro kit (about 140 +vat) 2 hours fitting, 35mm lowered, looks better, handles better, no ride quality loss, well worth it...heres a pic of mine before it went.... Quote
steve67car Posted February 3, 2007 Report Posted February 3, 2007 (edited) nice to see you still coming on here after the galaxy has gone even if you did buy a essex drug dealers gangsta ride (lol) needs some 22"rims but they dont do rs6 in that size :lol: Edited February 3, 2007 by steve67car Quote
Marky Posted February 3, 2007 Report Posted February 3, 2007 (edited) nice to see you still coming on here after the galaxy has gone even if you did buy a essex drug dealers gangsta ride (lol) needs some 22"rims but they dont do rs6 in that size :lol: :lol: watch out stevie or I'll send the hoodies round to liberate those new rims of yours :P :lol: :P Look at bit closer though mate.....its already running on 22's !!! Some nice blingtastic BSA Adventurers with 295/35/22 continentals!!!! I'll pm you soon (if you don't mind) thinking about retro fitting the gals mfd satnav into the freelander but have got a couple of questions about the gala feed....speak to you soon... :P Back to the thread....anyone interested in the rims pictured earlier on the gal please get in touch as they are for sale!!!! ATB, Marky Edited February 3, 2007 by Marky Quote
muffking Posted February 13, 2007 Author Report Posted February 13, 2007 Just had an interesting read of the owners manual regarding the weights of the car and load ratings of the tyres. The standard tyres have a load rating of between 93-97 depending on the model, which based on the load chart at http://www.etyres.co.uk/glossary-tyre-terms?term=load-rating equates to 650Kg-730Kg. The Owners manual states that the axle load for the 2.3 Petrol is 1210Kg on the front and 1280 on the rear, whech means 605Kg per corner on the fronts and 640Kg on each rear wheel. Unfortunately for me, my 235/40/18"s have a load rating of 91Y, or 615Kg according to the chart, which means that they are ok for the front, but 25Kg to lightweight for the rears. Have I got my maths right or can I fit them anyway and save me from having to buy some different tyres? Quote
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