Bigger than std. wheel/tyre combo???

chowy · 17-10-2005, 11:46

From what I gather my Tom Tom GPS states that my Furby speedo is around +6% out which I assume is accurate.

My thoughts are that if someone was to put wheel/tyre of a larger diameter than std. up to +6% it would be more accurate as well as having the advantage of filling the arches better.

Has anyone done this without having rubbing problems with arches? I'm talking about diameter, not width here (maybe small increase to 215mm tyre).

example of increased tyre size would be -

std 205/45/16 23.26 inch
17's 215/45/17 24.62 inch (+5.75% increase in diameter)
18's 215/40/18 24.77 inch ((+6.43% increase in diameter)

Just curious......

Shifty · 17-10-2005, 12:55

I'll be shoehorning some 18x8 wheels on this week with 215/35/18 on, i'll keep you posted.

chowy · 17-10-2005, 13:00

Quote:

Originally Posted by Shifty

I'll be shoehorning some 18x8 wheels on this week with 215/35/18 on, i'll keep you posted.

That's a +2.8% increase in diameter for your tyres.

I'd be very interested to hear your views on moving from 16" to 18" wheels. More in particular the ride quality!

Good to see you have Eibach springs too, same as me so I look forward to hearing from you!

robby · 17-10-2005, 18:14

I don't know which is spot on but my GPS was showing 67mph when the speedo showed 70mph (standard wheels/ tyres)
Wouldn't the profile be 40 with 17"s and 35 with 18"s?

Lummox · 17-10-2005, 18:27

Bit is the difference a constant 6%?

And what about tyre wear? There is a potential difference of around 6mm from a new tyre to a knackered one.

ag.morley · 17-10-2005, 18:39

I run 215/40/17..............Speedo is spot on with my Road Angel

devonutopia · 17-10-2005, 19:01

I run 205/40 R17s - My Navman says I am going just 2mph slower than I really am according to the speedo, when it reads 80mph.

I should think using 215/40 R17s on the front next time around will make it a bit closer to spot on, marginally.

chowy · 17-10-2005, 19:19

Quote:

Originally Posted by Lummox

Bit is the difference a constant 6%?

And what about tyre wear? There is a potential difference of around 6mm from a new tyre to a knackered one.

It's been 6% out from just about new and it's across the board, at least up to 100 (kph that is

)

Although I now have eibachs which look soo much better than std. there is still a gap between the arches. I don't necessarily want to go any lower but bigger wheels and tyres might help a little here and correct the speedo too!

I just think the arch size is a little too big for the std. wheel/tyre diameter size.

17-10-2005, 11:46	#1
chowy Briskodian Join Date: Apr 2005 Location: north east uk Posts: 762 Thanks: 0 Thanked 6 Times in 6 Posts	Bigger than std. wheel/tyre combo??? From what I gather my Tom Tom GPS states that my Furby speedo is around +6% out which I assume is accurate. My thoughts are that if someone was to put wheel/tyre of a larger diameter than std. up to +6% it would be more accurate as well as having the advantage of filling the arches better. Has anyone done this without having rubbing problems with arches? I'm talking about diameter, not width here (maybe small increase to 215mm tyre). example of increased tyre size would be - std 205/45/16 23.26 inch 17's 215/45/17 24.62 inch (+5.75% increase in diameter) 18's 215/40/18 24.77 inch ((+6.43% increase in diameter) Just curious...... __________________ Present: BMW 130i M Sport 2007 \| Titanium Silver (No need to use indicators no more ) Sadly gone: Skoda Fabia vRS 2005 \| Black Magic (for pleasure) Present: Skoda Octavia Ambiente 1.9 Tdi 2005 \| Diamond Silver (for work)

17-10-2005, 12:55	#2
Shifty www.oscarli.com Join Date: May 2005 Location: The home of witty banter™ Posts: 6,445 Images: 1 Thanks: 86 Thanked 155 Times in 92 Posts	I'll be shoehorning some 18x8 wheels on this week with 215/35/18 on, i'll keep you posted. __________________ Official 0 to 60 mph - 5.85 seconds. Standing 1/4 mile - 14.3 seconds. 251.5 BHP and 400 lbs/ft of torque. Oh - and 55 mpg on a run My car is for SALE!! www.fyldeperformancecars.com

17-10-2005, 18:14	#4
robby Briskodian Join Date: Aug 2005 Location: yorkshire Posts: 418 Thanks: 0 Thanked 0 Times in 0 Posts	I don't know which is spot on but my GPS was showing 67mph when the speedo showed 70mph (standard wheels/ tyres) Wouldn't the profile be 40 with 17"s and 35 with 18"s? __________________ Leon Cupra

17-10-2005, 18:27	#5
Lummox Cupra Bush King Join Date: Sep 2003 Location: Newport Pagnell Posts: 22,276 Images: 2 Thanks: 22 Thanked 734 Times in 616 Posts	Bit is the difference a constant 6%? And what about tyre wear? There is a potential difference of around 6mm from a new tyre to a knackered one. __________________ Unit 18 Automotive Services www.unit18.co.uk

17-10-2005, 18:39	#6
ag.morley Insecure Join Date: Sep 2004 Location: right on track........ Posts: 4,902 Thanks: 12 Thanked 79 Times in 33 Posts	I run 215/40/17..............Speedo is spot on with my Road Angel __________________ Join Now------>>>>><<<<<------woN nioJ............ "quote".... You can put lipstick on a pig; BUT it's still a pig,"...."unquote"...Barack Obama 2008

17-10-2005, 19:01	#7
devonutopia Mongreller Join Date: Apr 2003 Location: Exeter / Devon Posts: 30,057 Images: 5 Thanks: 76 Thanked 346 Times in 289 Posts	I run 205/40 R17s - My Navman says I am going just 2mph slower than I really am according to the speedo, when it reads 80mph. I should think using 215/40 R17s on the front next time around will make it a bit closer to spot on, marginally. __________________ Jason - Mongrel owner! WOOOOF! Grrrrr Custom Fabia Bonnet Lifter Kits - £45! Click Me. Cheesy bonnet lifter video to "raise me up" http://www.youtube.com/watch?v=hMnGECEi5Oc See the mongrel's 260bhp Dyno Video!

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