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Old 04-06-2016, 08:16 PM   #1
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Another tire and offset question

Whats up guys, first post here. I have a 2012GT with 20x10.5 in the rear. The offset is +43. My question is if 305/35zr20's will clear the fender without rubbing. The car is lowered 1.5" all around. I also just installed an adj panhard bar so the rear wheel isnt nearly as close as it looks in the picture. I currently have a set of worn 275/40's on the rear. Any help or input is greatly appreciated. Thank you for your time

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Old 04-06-2016, 10:07 PM   #2
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You'll touch with that one, my 20x10 with a 305 gets very close with +45 offsetClick image for larger version

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Old 04-06-2016, 10:46 PM   #3
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Thanks for the reply!! Do you think the extra half an inch in rim width would keep tire bulge to a minimum to give it those extra 2mm clearance? What brand tire are you using?? Oh and youve got one badass mustang btw!!
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Old 04-07-2016, 08:58 AM   #4
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Thanks for the reply!! Do you think the extra half an inch in rim width would keep tire bulge to a minimum to give it those extra 2mm clearance? What brand tire are you using?? Oh and youve got one badass mustang btw!!
Tires sectional width increases with rims increase.
Tire Rack says, "The industry rule of thumb is that for every 1/2" change in rim width, the tire's section width will correspondingly change by approximately 2/10".
You should check out this site. Allows you to compare how change will effect tire clearance. But you have to measure existing clearance to have something to compare it to.
Rim & Tire Size Calculator. Custom Offsets - Wheel-Size.com
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Old 04-10-2016, 04:29 AM   #5
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I'm curious, what brand of tires are your 275/40s?


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Old 04-10-2016, 05:16 PM   #6
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Hey GTaggie, I know you were asking for help, but it turns out you can help me!

Would you might taking some close up picks of your rear wheel/tire combo? (particularly from the side profile, trying to determine bulge) I've been debating on sizes myself with a 19x10.5 wheel in the rear.
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Old 04-10-2016, 06:50 PM   #7
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FYI

Here's a 275/35 on a 10.5" wide rim from another thread.
2012 RS3 Roush with 20X10.5 Niche Intake and VMP 675HP Tune.
No bulge. In fact, as you can see it may be a bit less then the wheel width.A 275 tire width is roughly 10.8"+/-, while the outside width of a 10.5" rim is close to 11". And I think this picture kinda of reflects that. Should ask AM why they recommend that tire size for that rim width, based on this abnormal appearance.
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Hopefully you are able to zoom in on this pic for a good look.

EDIT: Apparently a 275 is near the limits of the recommended width range, and as a result will widen a couple of tenths of an inch above it's normal width when mounted on a 1" wider rim.
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Old 04-10-2016, 07:23 PM   #8
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Thanks Diehard! That thread helps a lot!

Now I can see the difference between a 275 and 305 on the same size wheel.
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Old 04-11-2016, 10:43 PM   #9
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Originally Posted by k1DBLITZ View Post
Hey GTaggie, I know you were asking for help, but it turns out you can help me!

Would you might taking some close up picks of your rear wheel/tire combo? (particularly from the side profile, trying to determine bulge) I've been debating on sizes myself with a 19x10.5 wheel in the rear.
Pardon the dirty car but this is the only one i have from an angle that kinda shows tire bulge. I actually dropped her off at the body shop today (new hood), if not i would've snaped a better one.


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Old 04-11-2016, 10:54 PM   #10
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I'm curious, what brand of tires are your 275/40s?


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Nooooo ideeeeaaa to be honest haha. Some random economy tires i got for free from my wheel shop for my hardships with them, but ive actually seen Mickey Thompsons in 275/40zr20's
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Old 04-11-2016, 11:00 PM   #11
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Pardon the dirty car but this is the only one i have from an angle that kinda shows tire bulge. I actually dropped her off at the body shop today (new hood), if not i would've snaped a better one.


d00d... I'm not gonna lie... that is a really.......really bad pic. LOL. So many artifacts... thanks for trying though.

From that angle the tire doesn't look like it is peeled back...
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Old 04-11-2016, 11:04 PM   #12
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d00d... I'm not gonna lie... that is a really.......really bad pic. LOL. So many artifacts... thanks for trying though.

From that angle the tire doesn't look like it is peeled back...
Haha i know. I'll try to get you a better one sometime this week
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Old 04-12-2016, 03:41 PM   #13
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Originally Posted by k1DBLITZ View Post
Hey GTaggie, I know you were asking for help, but it turns out you can help me!

Would you might taking some close up picks of your rear wheel/tire combo? (particularly from the side profile, trying to determine bulge) I've been debating on sizes myself with a 19x10.5 wheel in the rear.


There you go
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Old 04-16-2016, 10:26 PM   #14
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Originally Posted by GTaggie View Post

There you go
So that's a 275/40 on a 20x10.5 rim?? Looks good I've been wondering if that would fit or if there was any problems cause I was wanting to go that route

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