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Tire size question on aftermarket wheels
rsvcc
 

Posts: 7
Joined: Mar 2015
Location: California
Post: #1
Tire size question on aftermarket wheels

Hey everyone,

I'm currently running a set of 20x8.5" +38mm wheels with 245/45 tires.

I find that 245/45 aren't "beefy" looking enough, if you know what I mean. The wheel wells just aren't full enough.

So my question is, can I fit 255/55r20's (RR 20 inch wheel OEM tire size) to these wheels without any rubbing/etc? In hopes of filling up the wheel well a bit more, without fitting spacers.

Edit: A quick calculation on willtheyfit.com shows an arch gap loss of 1.2 inches with that setup i mentioned..not too bad.

Thanks in advance.
(This post was last modified: 14-10-2015 03:52am by rsvcc.)
14-10-2015 02:14am
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Steve D
 

Posts: 400
Joined: Jul 2015
Location: Essexshire
Post: #2
RE: Tire size question on aftermarket wheels

I couldn't answer the 'will they rub' question but I'd think they'd throw your speedometer reading out as well as affect acceleration although they should give you better mpg.

Santorini SD4A Dynamic Lux with shadow chromes, ebony leather and privacy glass. Very Happy
14-10-2015 06:26am
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wheels
 

Posts: 161
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Location: Sweden
Post: #3
RE: Tire size question on aftermarket wheels

(14-10-2015 06:26am)Steve D Wrote:  I couldn't answer the 'will they rub' question but I'd think they'd throw your speedometer reading out as well as affect acceleration although they should give you better mpg.

Not sure about that. Most speedometer readings are "happy", mine shows about 5% more. So he would propably get a more correct reading.
15-10-2015 10:55am
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XFullFatTim
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Post: #4
RE: Tire size question on aftermarket wheels

Evoque shares its hub with Freelander2 but you say you want to fit "RR 20 OEM" - The hubs for L322 (previous FFRR and often miscalled the "Vogue"), L405 (current FFRR) and L494 (current RRS) are different so you would need to find an adapter. I'm sorry but I don't know the stud pattern dimensions or offsets but you could sign into FullFatRR.com with your babyRR sign in and ask there what the details are. You can sign into any of Martin's Forums with your BabyRR user name and password in case you weren't aware, so no need to reregister each time.

A Pangea Green New Defender 110 First Edition is now sitting on my drive alongside British Racing Green Electric Mini Cooper SE Level 3. After 21 years in my hands my TDI300 90 was handed on to the next custodian on 15 July 2022.
(This post was last modified: 15-10-2015 11:23am by XFullFatTim.)
15-10-2015 11:21am
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rsvcc
 

Posts: 7
Joined: Mar 2015
Location: California
Post: #5
RE: Tire size question on aftermarket wheels

(15-10-2015 11:21am)XFullFatTim Wrote:  Evoque shares its hub with Freelander2 but you say you want to fit "RR 20 OEM" - The hubs for L322 (previous FFRR and often miscalled the "Vogue"), L405 (current FFRR) and L494 (current RRS) are different so you would need to find an adapter. I'm sorry but I don't know the stud pattern dimensions or offsets but you could sign into FullFatRR.com with your babyRR sign in and ask there what the details are. You can sign into any of Martin's Forums with your BabyRR user name and password in case you weren't aware, so no need to reregister each time.

You're right..they are definitely different...
but, I'm not fitting the RR wheels, just the same size tire from OEM RR 20" inch wheels, ie. 255/55/r20.


I'm not too worried about the speedo reading issue, If anything, a slightly under-reporting speedometer is a good thing....my mind will feel satisfied going 5 over the limit everywhere, when in reality I'm following the limit!
16-10-2015 12:44am
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Steve D
 

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Joined: Jul 2015
Location: Essexshire
Post: #6
RE: Tire size question on aftermarket wheels

With larger diameter tyres, you will be going faster than your speedo shows, not slower!
Speedo will be 7.61% out according to this: http://www.willtheyfit.com/index.php?wid...te#content

Santorini SD4A Dynamic Lux with shadow chromes, ebony leather and privacy glass. Very Happy
(This post was last modified: 16-10-2015 05:42am by Steve D.)
16-10-2015 05:39am
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rsvcc
 

Posts: 7
Joined: Mar 2015
Location: California
Post: #7
RE: Tire size question on aftermarket wheels

Existing: 245/45r20
Speedo error = 0%
Reading at 30 MPH = 30 MPH
Reading at 60 mph = 60 mph

New: 255/55r20
Speedo error = -7.61%
Reading at 30 mph = 27.72 mph
Reading at 60 mph = 55.43 mph


this is directly from willtheyfit.com
So, in fact, the speedo would be under-reporting with the new, larger tires.
(This post was last modified: 16-10-2015 05:42pm by rsvcc.)
16-10-2015 05:40pm
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Steve D
 

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Location: Essexshire
Post: #8
RE: Tire size question on aftermarket wheels

My point exactly! A speedo that under reports means that you are going faster than it says you are!

Sorry, but you are reading that wrong.
From the same page: Circumference Existing tyre: 2288.7mm New tyre: 2477.1mm

So, for every revolution the speedo 'thinks' you have travelled 2288.7mm when in fact you have actually travelled 2477.1mm so you will be travelling faster than your speedo thinks you are going.

Have a look here: http://www.tyresizecalculator.com/tyre-w...calculator

Santorini SD4A Dynamic Lux with shadow chromes, ebony leather and privacy glass. Very Happy
(This post was last modified: 16-10-2015 06:35pm by Steve D.)
16-10-2015 06:32pm
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rsvcc
 

Posts: 7
Joined: Mar 2015
Location: California
Post: #9
RE: Tire size question on aftermarket wheels

(16-10-2015 06:32pm)Steve D Wrote:  My point exactly! A speedo that under reports means that you are going faster than it says you are!

Sorry, but you are reading that wrong.
From the same page: Circumference Existing tyre: 2288.7mm New tyre: 2477.1mm

So, for every revolution the speedo 'thinks' you have travelled 2288.7mm when in fact you have actually travelled 2477.1mm so you will be travelling faster than your speedo thinks you are going.

Have a look here: http://www.tyresizecalculator.com/tyre-w...calculator

Thanks...I was indeed interpreting that wrong. The circumference difference definitely proves it..
17-10-2015 04:19am
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wheels
 

Posts: 161
Joined: Jul 2015
Location: Sweden
Post: #10
RE: Tire size question on aftermarket wheels

BUT as I wrote before, most speedometers are happy. In my case if I put on tires like the OP wants I would have a speedo that shows 2,61% to little
17-10-2015 09:50am
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