Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: innes on 05 June 2012, 15:09:59

Title: not quite sure on these tyres...
Post by: innes on 05 June 2012, 15:09:59
my recently acquired 2.2 auto cd. has the original 16 inch alloys...but the tyre sizes are different from front to back???
Fronts are 215/55
back are both 255/55 and 225/55

i am not noticing any issues, should i make changes?
Title: Re: not quite sure on these tyres...
Post by: tunnie on 05 June 2012, 15:16:18
Much tread left? Not too much too worry about, I'd have some fun at round abouts & junctions then make sure you have same fitted all around  :y
Title: Re: not quite sure on these tyres...
Post by: innes on 05 June 2012, 15:21:46
loads of tread left!! and with new job only doing about 5 miles a day!
Title: Re: not quite sure on these tyres...
Post by: tunnie on 05 June 2012, 15:32:50
It may make your speedo slightly out, but apart from that no serious issues. Given cost of a pair of tyres, I'd just use them up  :y
Title: Re: not quite sure on these tyres...
Post by: Andy H on 05 June 2012, 16:19:40
The standard size on a 16" Omega rim is 225/55-16.

I don't imagine the smaller tyres on the front will make a massive difference but I would want to know why the wrong size was fitted in the first place :-\

The 255/55-16 on the rear is significantly over size. Small differences between the tyres on different axles is generally OK but it is NOT OK to have differing tyres on the same axle.
- One wheel will turn faster than the other so the differential will be constantly working
- The different diameters will want to steer the car round in circles
- The different diameters will make one brake more effective than the other
- The ABS will know that one wheel is turning slower than the others and may activate inappropriately or shut down altogether.
Title: Re: not quite sure on these tyres...
Post by: tunnie on 05 June 2012, 16:28:34
The standard size on a 16" Omega rim is 225/55-16.

I don't imagine the smaller tyres on the front will make a massive difference but I would want to know why the wrong size was fitted in the first place :-\


Suspect cost of the tyre  :-\
Title: Re: not quite sure on these tyres...
Post by: TheBoy on 05 June 2012, 17:45:16
different sized tyres on same axle is a no-no.

your call, but the only contact between your 1.7t missile and the earth is those tyres  :-X
Title: Re: not quite sure on these tyres...
Post by: dbug on 05 June 2012, 18:05:58
different sized tyres on same axle is a no-no.

your call, but the only contact between your 1.7t missile and the earth is those tyres  :-X

Agreed different sized tyres on same axle is a massive no.  Would get the 255/55 swapped for a 225/55 asap - if you're stopped by an observant Mr Plod you may well get done for different size tyres on same axle!! ;)
Title: Re: not quite sure on these tyres...
Post by: flyer 0712 on 05 June 2012, 18:31:20
Yep i thought that to have different sizes on the same axle is illegal....i was stopped recently by vosa and one of the things they checked were my tyres,and they noticed that i had 240   on the front and 245 on the rear and actually commented on it but it was ok.....so just goes to show they do look...
Title: Re: not quite sure on these tyres...
Post by: cem_devecioglu on 05 June 2012, 20:02:07
different sized tyres on same axle is a no-no.

your call, but the only contact between your 1.7t missile and the earth is those tyres :-X

+1
Title: Re: not quite sure on these tyres...
Post by: Agemo on 05 June 2012, 20:13:25
The difference between the width is 30mm on the Lotus Carlton (235/40 front, 265/40 rears). I am not one for fitting massive tyres (nor skinny ones either) but I can't understand why the previous owner has gone bigger AND smaller.
Title: Re: not quite sure on these tyres...
Post by: innes on 05 June 2012, 20:48:01
Cheers guys.  Will see if my local will swap for a partworn. Should I go for 255 or 225 on the back?
Title: Re: not quite sure on these tyres...
Post by: Andy H on 05 June 2012, 21:26:49
Cheers guys.  Will see if my local will swap for a partworn. Should I go for 255 or 225 on the back?

Quote
The standard size on a 16" Omega rim is 225/55-16.
Title: Re: not quite sure on these tyres...
Post by: Del Boy on 06 June 2012, 12:51:24
Cheers guys.  Will see if my local will swap for a partworn. Should I go for 255 or 225 on the back?

Go for 225-55-16. That's the size they should be. Some cars have staggered fitment where the rears will be wider. You should never have two different sizes on the same axle though.
Title: Re: not quite sure on these tyres...
Post by: innes on 06 June 2012, 13:25:55
all done and changed. ta for the info!!
Title: Re: not quite sure on these tyres...
Post by: gremlin66 on 06 June 2012, 14:18:43
While you guys are on the subject of tyres, what is the official size for the 17's on the phase 2's?? Was thinking about getting the 17'' 5 spokes off the phase 2 for mine.
Title: Re: not quite sure on these tyres...
Post by: RobG on 06 June 2012, 14:21:53
235/45/17