when i 1st joined someone said it fecks the handling up..... why? has anyone fitted 18s, i really want some.... thinking about golf r32 alloys and the smallest are 18's 
18" wheels on an ibiza
- Thread starter ibizasport16v
- Start date
aye its a stiffer ride and you feel the bumps more but nothing major, ive had them on for bout a year now and am used to them but i remember when i first fitted them i noticed a big difference in the steering, it was a bit heavier but as i said you get used to it. f you want the look i say go for the 18s but if you wanna keep your handling as it is keep the 16s on it
Give the link below a click and you can soon find out what the right size tyres you need to keep your speedo the same.
http://www.rochfordtyres.co.uk/TyreCalc.asp
http://www.rochfordtyres.co.uk/TyreCalc.asp
T. Spark
Guest
With 18's your Speedo will no longer be accurate, due to the larger circumference of the Wheels (compared to 'standard' factory fitted 15 or 16's). Also the faster you drive, the more un-accurate the reading on the Speedo will become.
No big deal until you are cruising along the motorway *thinking* you are driving around 75mph, when infact it's around 85mph.... are those flashing Blue lights in my rear view mirror... or a Chav with OTT blue-neon windscreen washer jets
They dont read right as standard, so chances are 18's would make it actually read right
Pedro strikes again
the difference between the 16s and 18s with low profiles is pretty small but thers enough of a diff that when i had to put the 16 spare on the front the other day it mucked about with the traction control, so it sensed a difference in how quick the two wheels were turning
Fitting larger Alloys, the Speedo will read your speed as being SLOWER than what the car is actually travelling at (as the Speedo would have been calibrated at the factory, with the standard 15 or 16 inch wheels fitted).
The larger the wheels are from standard, the more in-accurate the Speedo will become.
The only way to accurately test this, would be with the use of a Speed trap/gun, or using a GPS device.....
Cruise along at a steady 70mph (BY LOOKING AT YOUR SPEEDO), then look at the GPS device to see what your ACTUALLY doing
Afterwards, repeat this test once you have your shiny 18's fitted, and see what the speed difference between the Speedo and the GPS is then.
Will be an interesting test, please report back if anyone can try this!
I think general opinion is that the speedo doesn't read correctly anyway (as mentioned by T.Spark) so that's what Sisson is on about. I'm guessin he knows the principle of it all
stevie.w - Lovein your motor mate, looks lush
Try this for wheel size comparison http://www.miata.net/garage/tirecalc.html
Try this for wheel size comparison http://www.miata.net/garage/tirecalc.html
Fitting larger Alloys, the Speedo will read your speed as being SLOWER than what the car is actually travelling at (as the Speedo would have been calibrated at the factory, with the standard 15 or 16 inch wheels fitted).
The larger the wheels are from standard, the more in-accurate the Speedo will become.
The only way to accurately test this, would be with the use of a Speed trap/gun, or using a GPS device.....
Cruise along at a steady 70mph (BY LOOKING AT YOUR SPEEDO), then look at the GPS device to see what your ACTUALLY doing
Afterwards, repeat this test once you have your shiny 18's fitted, and see what the speed difference between the Speedo and the GPS is then.
Will be an interesting test, please report back if anyone can try this!
When I have fitted bigger alloys to any car the GPS has matched the speedo more, so I would say bigger wheels, up to a point, make the speedo more accurate. With 16's on my Ibiza is around 3-4mph fast on the speedo
So you are a boy racer who wants the biggest size Alloys that will physically fit into the arches of your SEAT Ibiza.... who cares what the Speedo says or even if it's accurate, your probably too busy getting hypnotized by your neon washer jets
I hope you're not referring to me as a boy racer
ibizasport16v said:
IMO
hell no
I've got 17s and I think any bigger wouldn't look good. I had 15s before and the ride was smoother because of the higher profle tyres. You're gonna need 35s I guess on 18s
If you really wanna go big, go all the way
i could try it as i have tom tom but i dont really have a set of alloys or steels for that matter lying around in my garage lol the speedo on mine sits about 4 mph slower than tom tom says..... i had 16" alloys on my mk3 ford fiesta 1.1! which had 13's as standard lol the handleing was alot better but it burnt oil and alot more fuel so i sold them to a mondeo driver lol
......that's right, and fitting 18's means the Speedo will be EVEN MORE unreliable than what it already is, so that's 'what I'm on about' too.
How so? If you maintain an equal rolling radius through the use of lower profile tyres then you won't actually change the gearing and so the speedo reading?
Or does simple mathematics not apply to wheel radii?
make sure the width of the wheel is less than 8. As i had rs4 genuine wheels on mines and tyres where catching front wings.
Either that u put a very low profile tyre on it.
I had 224/40/18.
So i'd go for 7.5 width on an 18 wheel which could be hard to find
Either that u put a very low profile tyre on it.
I had 224/40/18.
So i'd go for 7.5 width on an 18 wheel which could be hard to find
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