Tires
Veteran Member
Joined: Dec 2017
Posts: 1,236
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From: The Netherlands Central Highlands - Veluwe-
In winter, to avoid skidding, I would increase the ground pressure by using narrower winter tires. Altough with more and wider profile, you already get that with the same size/width . Best is to speak with forum members in your region,
as the car is around for some years and maybe someone uses its as a daily comuter..
Veteran Member
Joined: Mar 2015
Posts: 7,420
Likes: 2,394
From: Hastings
If you get 4 new tires you will have warranty!!
You will get 10% off
You will get performance and peace of mind.
Or you could get 2 tires and get that old beater feel to a nearly new car. As you say time is non renewable, you may never again put new tires on this car.
You will get 10% off
You will get performance and peace of mind.
Or you could get 2 tires and get that old beater feel to a nearly new car. As you say time is non renewable, you may never again put new tires on this car.
Senior Member
Joined: Apr 2018
Posts: 241
Likes: 65
From: Greensburg, PA
If you have OEM 295s on the rear then you have 255s on the front. If you don't have adapters or spacers on the car, you can safely go up 10mm both front and back. Some of us have upsized the rear only and others have upsized the front as well.
Here are actual diameters:
255/35-20 27.0" (OEM)
295/30-20 27.0" (OEM)
265/35-20 27.3"
305/30-20 27.2"
245/40-19 26.7" (OEM)
285/35-19 26.9" (OEM)
Upsizing by 10mm only increases the diameter by 1.1%. The speedometer will still read higher than actual. You will note that the 19" OEM tire size is a smaller diameter than the 20" tires by that same margin. No laws concerning tire size in the U.S. other than they cannot stick out beyond the fender. I can't wax poetic on handling improvement as I had upsized when I transitioned from the Pirellis. (stepwise improvement in handling).
Here are actual diameters:
255/35-20 27.0" (OEM)
295/30-20 27.0" (OEM)
265/35-20 27.3"
305/30-20 27.2"
245/40-19 26.7" (OEM)
285/35-19 26.9" (OEM)
Upsizing by 10mm only increases the diameter by 1.1%. The speedometer will still read higher than actual. You will note that the 19" OEM tire size is a smaller diameter than the 20" tires by that same margin. No laws concerning tire size in the U.S. other than they cannot stick out beyond the fender. I can't wax poetic on handling improvement as I had upsized when I transitioned from the Pirellis. (stepwise improvement in handling).
No issues behind the rear wheels.
Last edited by Unhingd; Jul 22, 2018 at 08:04 AM.
Junior Member
Joined: Mar 2017
Posts: 26
Likes: 3
From: New Jersey
If you have OEM 295s on the rear then you have 255s on the front. If you don't have adapters or spacers on the car, you can safely go up 10mm both front and back. Some of us have upsized the rear only and others have upsized the front as well.
Here are actual diameters:
255/35-20 27.0" (OEM)
295/30-20 27.0" (OEM)
265/35-20 27.3"
305/30-20 27.2"
245/40-19 26.7" (OEM)
285/35-19 26.9" (OEM)
Upsizing by 10mm only increases the diameter by 1.1%. The speedometer will still read higher than actual. You will note that the 19" OEM tire size is a smaller diameter than the 20" tires by that same margin. No laws concerning tire size in the U.S. other than they cannot stick out beyond the fender. I can't wax poetic on handling improvement as I had upsized when I transitioned from the Pirellis. (stepwise improvement in handling).
Here are actual diameters:
255/35-20 27.0" (OEM)
295/30-20 27.0" (OEM)
265/35-20 27.3"
305/30-20 27.2"
245/40-19 26.7" (OEM)
285/35-19 26.9" (OEM)
Upsizing by 10mm only increases the diameter by 1.1%. The speedometer will still read higher than actual. You will note that the 19" OEM tire size is a smaller diameter than the 20" tires by that same margin. No laws concerning tire size in the U.S. other than they cannot stick out beyond the fender. I can't wax poetic on handling improvement as I had upsized when I transitioned from the Pirellis. (stepwise improvement in handling).
The tire size affects the odometer to the same extent as it does the speedometer. Install Waze in your phone and tell me how fast it indicates you are going when your speedometer is reading 60mph (or any other speed for that matter). Use cruise control to do this. I can then tell you what your speedometer error will be with the 305 tire. Based on my experience the indicated speed is now within 1mph on the high side at 60mph.
I chose not to go with the 265 on the front because I was uncertain whether that would work with my 15mm hub adapters.
I chose not to go with the 265 on the front because I was uncertain whether that would work with my 15mm hub adapters.
Veteran Member
Joined: Feb 2014
Posts: 9,016
Likes: 3,656
From: Adelaide, South Australia
Yep, as Lance says, going from 295s to 305s on the rear will cause your speedo to "under-read" by around 1 mph at 60 mph.
In other words, if your speedo says 60 mph you are really doing around 61 mph.
BUT, the F-Type speedo is around 5% optimistic at 60 mph anyway (5% over-read), so when your speedo says 60 mph you are only really doing around 57 mph.
So going to the 305s will correct this error just a little and your true speed will be closer to 58 mph.
Same effect with odometer.
In other words, if your speedo says 60 mph you are really doing around 61 mph.
BUT, the F-Type speedo is around 5% optimistic at 60 mph anyway (5% over-read), so when your speedo says 60 mph you are only really doing around 57 mph.
So going to the 305s will correct this error just a little and your true speed will be closer to 58 mph.
Same effect with odometer.
Last edited by OzXFR; Jul 23, 2018 at 02:49 AM.
Veteran Member
Joined: Sep 2013
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From: Gold Coast, Oz
Hey apropos tyre sizes, I have my F Type wheels coming off. The tyres are 245/40ZR19, and have heaps of meat still on them as I have just done 20,000km on them. Then my missus has her XE. The tyres are 225/40ZR19. Would I be able to use the F Type tyres on the XE when they need replacing?
Veteran Member
Joined: Feb 2014
Posts: 9,016
Likes: 3,656
From: Adelaide, South Australia
Hey apropos tyre sizes, I have my F Type wheels coming off. The tyres are 245/40ZR19, and have heaps of meat still on them as I have just done 20,000km on them. Then my missus has her XE. The tyres are 225/40ZR19. Would I be able to use the F Type tyres on the XE when they need replacing?
They would fill out the wheel well by an extra 8 mm and stick out an extra 10 mm, both of which would be in tolerance for an XE and probably make it look a helluva lot better.
But that is only one end, from memory the 19" tyres on the rear of your F-Type are a bit bigger, 275/35R19 I think, which if I am correct would be too big for the missus' XE.
So I reckon your F-Type front tyres would be OK on the rear of the missus' XE but that's about it.
Hey apropos tyre sizes, I have my F Type wheels coming off. The tyres are 245/40ZR19, and have heaps of meat still on them as I have just done 20,000km on them. Then my missus has her XE. The tyres are 225/40ZR19. Would I be able to use the F Type tyres on the XE when they need replacing?
Last edited by Unhingd; Jul 23, 2018 at 08:39 AM.
Veteran Member
Joined: Sep 2013
Posts: 4,109
Likes: 1,396
From: Gold Coast, Oz
Cheers, it looks as though we have 255/35R19 on the back of the XE but 245/40R19 on the front of the F Type and 275/35ZR19 on the back. It might be easier just sticking the F Type wheels on the XE, though I may end up selling them if the Vorsteiners are comfy enough.
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Joined: May 2013
Posts: 6,989
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From: Metrowest Boston
The F-type tires are about 3% larger (0.6-0.7" diameter) than the XE tires. Assuming this fits OK, it should introduce -3% error to your odometer/speedometer, i.e. you'd actually be going 3% faster than the speedometer indicates (not including the preexisting speedometer error.)
I think...
I think...
Veteran Member
Joined: Feb 2014
Posts: 9,016
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From: Adelaide, South Australia
Bruce, it is possible the F-Type wheels with tyres may not fit/work on the XE especially at the rear as I suspect the offsets (again especially the rear) are very different.
Easy enough to test though, just fit 'em and have a look!
The other option is to whip two wheels off the XE, one front and one back, read the offsets (printed/engraved/whatever on the inside) and compare them with the offsets of the F-Type wheels.
Easy enough to test though, just fit 'em and have a look!
The other option is to whip two wheels off the XE, one front and one back, read the offsets (printed/engraved/whatever on the inside) and compare them with the offsets of the F-Type wheels.
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Joined: Sep 2013
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From: Gold Coast, Oz
Yeah, Also I wouldnt like to ruin the ride and handling in the XE which is really, really good. I am learning heaps, this is quite interesting.
Online it suggests that XE has offsets of 45 and 55 F & R respectively, the F Type is 49 and 27. So I guess that the big difference on the rears would be a problem, as you mentioned.
Online it suggests that XE has offsets of 45 and 55 F & R respectively, the F Type is 49 and 27. So I guess that the big difference on the rears would be a problem, as you mentioned.
Veteran Member
Joined: Feb 2014
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Likes: 3,656
From: Adelaide, South Australia
Yep, that's a difference of 28 mm offset on the rear wheels which is yuge, no way the F-Type rears will fit on the rear of the XE without the tyres hanging out way past the fenders!
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