Thoughts? I am increasing the width of front OEM OZ wheels
Discussion
I was luckily enough to pickup a second set of wheels. My plan is to increase the width of the front wheels by two inches. I know I will lose turning radius but I am fine with that in exchange for better track performance and maintaining the OEM look. Before I make the mod, I am looking for a set of tires that would be available. My plan is to shoot for a 295 front tire as I have a friend that has gone with that size. My wheel size will be a 18x11. I am getting mixed information a to what is the optimum size tire for a 18x11 wheel. Does anyone have an opinion. Then I will start to search for tires for the configuration front and back brand tire.
Steve_D said:
I suspect rather than just lock issues you will find the tyre will now hit the back of the headlights and the front of the side pods.
Steve
His mate is running them apparently, so these issues are either not there (though OP mentions reduced lock) or they have a bespoke solution. Steve
srreck said:
295 at the front???
Join for a good gym. You will need extra biceps or a power steering.
Just finished fitting my EPAS (mainly for parking manoeuvres) and I'm well pleased with the result.Join for a good gym. You will need extra biceps or a power steering.
DC electronics controller has made a big difference to the adjustability of assistance.
I have 245/30x18 with road Pirellis and 285/30x18 Track Khumos.
I have changed the scrub radius with longer wishbones and wheel offset so the wide tyres don't touch the bodywork. The square shoulder on the Khumos does lead to tramlining but they are awesome on track.
For road use the 245's offer good grip and if you need more you must be taking some big risks!
Paul
I have changed the scrub radius with longer wishbones and wheel offset so the wide tyres don't touch the bodywork. The square shoulder on the Khumos does lead to tramlining but they are awesome on track.
For road use the 245's offer good grip and if you need more you must be taking some big risks!
Paul
Thanks for the comments. Looks like I will most likely go with a Toyo R888 295/30ZR18 (recommended wheel width 10.5). I need to decide to widen the front OZ wheel by 1.5 or 2 inches. Note for the front going from a 35 to a 30. This should provide a little clearance. Also, the R888 is available for the rear with size 335/30ZR18.
I do have the rear slim light covers. Also, a year a ago, I did purchase two head lights that are not as deep as the OEM provided headlight, with these, I would be able to totally remove the hump on the rear cover to have plenty of clearance.
I plan to only increase the inner barrel increasing the width and then limit turning radius.
By the, increasing the wishbone length and changing the wheel offset, I hadn't thought of that. Did you create your own wishbone replacement?
I do have the rear slim light covers. Also, a year a ago, I did purchase two head lights that are not as deep as the OEM provided headlight, with these, I would be able to totally remove the hump on the rear cover to have plenty of clearance.
I plan to only increase the inner barrel increasing the width and then limit turning radius.
By the, increasing the wishbone length and changing the wheel offset, I hadn't thought of that. Did you create your own wishbone replacement?
2001ultima - it's difficult to mount the kingpins/brakes deeply enough in the wheels to provide perfect geometry. The solution on my car was to source a 1 inch deep outer rim and mount the wheel inner on the outside of it. Looks as ugly as sin but seemed the only solution at the time.
A 285 30 18 will be 2mm or -0.1% smaller in circumference than OEM fitment.
A 295 30 18 will be 17mm or +4.5% bigger in circumference
All manufacturer dependant (not all manufacturers sizes are alike)
I'm with Rusti on this one the 285 30 should have less impact on clearance overall and availability is the clincher.
Rusti I like your "left of field" approach to your off-set problem
A 295 30 18 will be 17mm or +4.5% bigger in circumference
All manufacturer dependant (not all manufacturers sizes are alike)
I'm with Rusti on this one the 285 30 should have less impact on clearance overall and availability is the clincher.
Rusti I like your "left of field" approach to your off-set problem
[quote=F.C.]A 285 30 18 will be 2mm or -0.1% smaller in circumference than OEM fitment.
F.C., Good information regarding the 285 dimension rather then the 295. Also, I would only need to add 1.5 inch (total 18x10.5) to the inner wheel width rather then 2 inches recommended for the 295.
Regarding the lights. I would suspect you can find a similar light; however, the replacement I purchased but have not installed were referenced to me by a person I know that built two Ultimas. With the last build he went with 19 inch wheels and need all the space possible so a pair of these lights were installed / fabricated to eliminate the hump on the rear light cover. http://optronicsinc.com/driving2-new.html Model: QH-85CD. Dimensions: 3.5" W x 3.5" H x 2.5" D. They are 55-watt. It's an option.
F.C., Good information regarding the 285 dimension rather then the 295. Also, I would only need to add 1.5 inch (total 18x10.5) to the inner wheel width rather then 2 inches recommended for the 295.
Regarding the lights. I would suspect you can find a similar light; however, the replacement I purchased but have not installed were referenced to me by a person I know that built two Ultimas. With the last build he went with 19 inch wheels and need all the space possible so a pair of these lights were installed / fabricated to eliminate the hump on the rear light cover. http://optronicsinc.com/driving2-new.html Model: QH-85CD. Dimensions: 3.5" W x 3.5" H x 2.5" D. They are 55-watt. It's an option.
Edited by 2001ultima on Wednesday 7th August 04:22
im interested in this too.. ready to order new tyres and also widen my front rims to suit..
anyone have some experience in 1.5 inch wider and headlight/bodywork rubbing... ill restrict the steering lock for body work.
im ready to order either standard 335/30/18 mitchelin ps2 and 245/35/18 mitchelin super sports or
if I widen toyo r888 335/30/18 and 285/30/18
dom
anyone have some experience in 1.5 inch wider and headlight/bodywork rubbing... ill restrict the steering lock for body work.
im ready to order either standard 335/30/18 mitchelin ps2 and 245/35/18 mitchelin super sports or
if I widen toyo r888 335/30/18 and 285/30/18
dom
If you are not planning to change the length of your wishbones I think you will have issues.
You could check this by taping some cardboard to the circumference of the tyre to increase the width of the inner side of the tyre, lower onto the ground and turn from lock to lock.
I think you will find it fouls on the sidepod and light pod cover.
Try before you buy!!!!
Paul
You could check this by taping some cardboard to the circumference of the tyre to increase the width of the inner side of the tyre, lower onto the ground and turn from lock to lock.
I think you will find it fouls on the sidepod and light pod cover.
Try before you buy!!!!
Paul
hi Paul
im intending in following Jims old advise. limiting the steering so 2 turns lock to lock instead of 3.
standard wishbones, I have modified light boxes already.
the wheel will be either 10 or 11 inch.
this will depend on the discussions im having with the technical at Mitchelin Tyres.
im intending in following Jims old advise. limiting the steering so 2 turns lock to lock instead of 3.
standard wishbones, I have modified light boxes already.
the wheel will be either 10 or 11 inch.
this will depend on the discussions im having with the technical at Mitchelin Tyres.
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