#1: Tyre profile can i go from 55 to 50? Author: kenny16m, Location: LlantrisantPosted: Sat Nov 20, 2010 11:22 am ---- I need a new set of tyres and im looking for a set of 195 55 15 are £330
But for the same make tyres but size 195 50 15 are £198
Thats saving me £132 thats alot of cash
Is it ok to reduce the profile size by 5? or will i have problems?
#2: Re: Tyre profile can i go from 55 to 50? Author: Mikey2uk, Location: StevenagePosted: Sat Nov 20, 2010 11:25 am ---- Yes that would be fine I have done the same, speedo will be about 4mph out but its not a problem.
#3: Re: Tyre profile can i go from 55 to 50? Author: M60SHW, Location: CarlislePosted: Sat Nov 20, 2010 11:26 am ---- No problems if your gettin all 4 and are they the same make and everything? Seams like a he'll of a hike in price lol
#4: Re: Tyre profile can i go from 55 to 50? Author: Lecktorious, Location: ScotlandPosted: Sat Nov 20, 2010 11:26 am ---- As Mikey said, knocks the speedo out ever so slightly but saves a small fortune!
#5: Re: Tyre profile can i go from 55 to 50? Author: kenny16m, Location: LlantrisantPosted: Sat Nov 20, 2010 11:29 am ---- Was talking to a guy a while ago and he was saying that the 55 profile is quite 'rare' as alot use the 50 and thats why tyres are cheaper, i was just not sure what difference it would do
#6: Re: Tyre profile can i go from 55 to 50? Author: PUG91, Location: ShropshirePosted: Sat Nov 20, 2010 11:30 am ---- can you get your speedo re-calibrated or anything?
#7: Re: Tyre profile can i go from 55 to 50? Author: skard, Location: UK - NorthPosted: Sat Nov 20, 2010 11:30 am ---- i've been using 195/50's for over three years with no problem.
my 206 originally had 175/65/14's on. in my case, the 50's are actually closer to the overall circumference than 55's so affects my speedo less.
#8: Re: Tyre profile can i go from 55 to 50? Author: M60SHW, Location: CarlislePosted: Sat Nov 20, 2010 11:38 am ---- You don't need to calibrate the speedo youl bearly notice anything And all speedos are out anyway
#9: Re: Tyre profile can i go from 55 to 50? Author: PUG91, Location: ShropshirePosted: Sat Nov 20, 2010 11:40 am ----
Shaw-pug wrote:
You don't need to calibrate the speedo youl bearly notice anything And all speedos are out anyway
So you have no excuse for speeding or something I heard?
#10: Re: Tyre profile can i go from 55 to 50? Author: rubyspilot, Posted: Sat Nov 20, 2010 11:48 am ---- When you change from 55 to 50 you will reduce the sidewall height by about 1cm.
This will reduce the rolling radius of the tyre by about 10cm.
Therefore the speedo will be 3.3% less than indicated.
IE when your speedo reads 30 you will actually be doing 29
when it reads 60 you will actually be doing 58
Maybe a slightly stiffer ride quality.......apart from that no problem.....
#11: Re: Tyre profile can i go from 55 to 50? Author: Edward, Location: In the garagePosted: Sat Nov 20, 2010 12:01 pm ---- Will accelerate quicker too!
#12: Re: Tyre profile can i go from 55 to 50? Author: kenny16m, Location: LlantrisantPosted: Sat Nov 20, 2010 12:40 pm ---- cool new set of rubber then before the snow comes in
#13: Re: Tyre profile can i go from 55 to 50? Author: xbonez182, Location: BirminghamPosted: Sat Nov 20, 2010 1:15 pm ---- 195 50 15 for me too....i didnt know that profile set your speedo out but meh. its a slightly stiff ride compared to the steels i was on before
#14: Re: Tyre profile can i go from 55 to 50? Author: Locky, Location: Newcastle / PlymouthPosted: Tue Dec 14, 2010 4:57 am ---- Alright all, im glad i found this thread as have also been wondering about fitting 50s instead of 55s.
Slight evolution to the question as I already have 2x Pirelli P6000 195 55 15s but need 2 new tyres - so can I get 50's and run them ok with 55s? (obviously paired per axle)
If so, which is best to have up front?
#15: Re: Tyre profile can i go from 55 to 50? Author: panason1c, Location: SomersetPosted: Tue Dec 14, 2010 5:02 am ---- Apart from a minor change to the speedo reading you will notice a slightly 'firmer' ride as the shallower tyre absorbs less of the bumps in the road.
Note...... use a sat nav, or similar, to check the speedo against the accurate sat nav reading
#16: Re: Tyre profile can i go from 55 to 50? Author: Locky, Location: Newcastle / PlymouthPosted: Tue Dec 14, 2010 5:15 am ----
panason1c wrote:
Apart from a minor change to the speedo reading you will notice a slightly 'firmer' ride as the shallower tyre absorbs less of the bumps in the road.
Note...... use a sat nav, or similar, to check the speedo against the accurate sat nav reading
cheers for the reply panason1c - i was already aware of the impact on the rolling circumference and speed reading. im not too concerned by 3% lower readings
My question was, is it ok to run 50's on the front and 55's on the rear (or vice versa).
#17: Re: Tyre profile can i go from 55 to 50? Author: Mikey2uk, Location: StevenagePosted: Tue Dec 14, 2010 5:16 am ---- I would keep the same profile all round mate personally
#18: Re: Tyre profile can i go from 55 to 50? Author: Locky, Location: Newcastle / PlymouthPosted: Tue Dec 14, 2010 5:26 am ----
Mikey2uk wrote:
I would keep the same profile all round mate personally
Dont get me wrong, ideally I would just buy 2x 55's - but you cannot ignore the difference in price for 50's - especially at xmas time!
I was planning on doing this in the new year, but with yet more snow forcast, I really need to lose my 'option' Pirelli Nero 17's and get something a bit more suited to snow and ice.
I know running 2 different profiles isnt ideal, but if both are ok to run individually, could they really cause that much bother paired up?
Haha I wont even ask about running Sirrys up front and Vortex's at the back
#19: Re: Tyre profile can i go from 55 to 50? Author: meady, Location: basingstokePosted: Tue Dec 14, 2010 5:26 am ---- It wnt mater just so long as the two on the front axle are the same you can have a 14" and a 17" wheel on the back if ya like
#20: Re: Tyre profile can i go from 55 to 50? Author: panason1c, Location: SomersetPosted: Tue Dec 14, 2010 5:44 am ----
Locky wrote:
My question was, is it ok to run 50's on the front and 55's on the rear (or vice versa).
I would think the only issue with that would be one of insurance cover?.....your insurance might be affected if you had a bump and the mix of tyre sizes was involved due to a handling issue.
Another problem would be that you would need to carry two spare tyres, one of each size, otherwise you would be breaking the law if you mixed two different tyre sizes on the same axle in the event of having a puncture.
ps........... a 'spacesaver' spare wheel is the only exception to the rule of requiring both tyres on the axle to be the same size, etc.
#21: Re: Tyre profile can i go from 55 to 50? Author: Locky, Location: Newcastle / PlymouthPosted: Tue Dec 14, 2010 6:10 am ----
panason1c wrote:
Locky wrote:
My question was, is it ok to run 50's on the front and 55's on the rear (or vice versa).
I would think the only issue with that would be one of insurance cover?.....your insurance might be affected if you had a bump and the mix of tyre sizes was involved due to a handling issue.
Another problem would be that you would need to carry two spare tyres, one of each size, otherwise you would be breaking the law if you mixed two different tyre sizes on the same axle in the event of having a puncture.
ps........... a 'spacesaver' spare wheel is the only exception to the rule of requiring both tyres on the axle to be the same size, etc.
Well both tyres would be identical per axle - baring a puncture and needing a space saver being the exception.
I suppose the implications of an insurance company deeming a 2x2 mix of tyre profiles unsafe are not to be taken lightly. I guess its looking more like im buying two 55s then!!
Just something thats come to mind, I see there are a lot of folks on here who run 50s all round rather than the factory/recommended 55s - so would that itself not have insurance implications come claim time?
#22: Re: Tyre profile can i go from 55 to 50? Author: panason1c, Location: SomersetPosted: Tue Dec 14, 2010 6:14 am ---- I think the mix of different sizes on the two axles might be of more concern to an insurance company due to having more of an effect on the handling than same size tyres all round.
#23: Re: Tyre profile can i go from 55 to 50? Author: panason1c, Location: SomersetPosted: Tue Dec 14, 2010 6:22 am ---- Just had a thought...............A possible problem of fitting non-matching profiles to a vehicle fitted with ABS would create different rolling diameters between the two axles and would probably cause the ABS to disable and the light to stay on due to the abs system ecu being 'confused' by receiving signals from each wheel sensor that dont match the same rpm.
#24: Re: Tyre profile can i go from 55 to 50? Author: Locky, Location: Newcastle / PlymouthPosted: Tue Dec 14, 2010 6:27 am ----
panason1c wrote:
Just had a thought...............A possible problem of fitting non-matching profiles to a vehicle fitted with ABS would create different rolling diameters between the two axles and would probably cause the ABS to disable and the light to stay on due to the abs system ecu being 'confused' by receiving signals from each wheel sensor that dont match the same rpm.
Yeah that had crossed my mind too mate.
There doesnt seem to be a very good selection of 55s to choose from compared to the 50 range.
Reading up on the reviews, it would also seem the Pirelli P6000 (55s) which I already have are useless in winter conditions, as are Toyo T1R Proxes which was gonna be my second tyre choice.
Now im wondering if it would be better to get 4 new 50s rather than 2 new 55s.
#25: Re: Tyre profile can i go from 55 to 50? Author: panason1c, Location: SomersetPosted: Tue Dec 14, 2010 6:33 am ---- Sounds like 4 x 50's is the way to go.....
#26: Re: Tyre profile can i go from 55 to 50? Author: Locky, Location: Newcastle / PlymouthPosted: Tue Dec 14, 2010 6:49 am ----
panason1c wrote:
Sounds like 4 x 50's is the way to go.....
Ideally yes it would if I had the moneys!! Bah!
Shame 4x 50's still work out more expensive than 2x 55s lol
#27: Re: Tyre profile can i go from 55 to 50? Author: Seabook, Posted: Tue Dec 14, 2010 7:24 am ---- this is normal lol
#28: Re: Tyre profile can i go from 55 to 50? Author: Mikey2uk, Location: StevenagePosted: Tue Dec 14, 2010 7:49 am ---- If you going for 4x 50 I would recomend the Bridgestones EZ300 I have got these on mine and they are a really good tyre. I first had them on last year and have done 30k on them and have only just replaced the fronts.
The arent bad on price either. I think blackcircles.co.uk are dong them for £55 each.
#29: Re: Tyre profile can i go from 55 to 50? Author: roberto.f, Location: Coventry/ManchesterPosted: Tue Dec 14, 2010 7:54 am ----
panason1c wrote:
Just had a thought...............A possible problem of fitting non-matching profiles to a vehicle fitted with ABS would create different rolling diameters between the two axles and would probably cause the ABS to disable and the light to stay on due to the abs system ecu being 'confused' by receiving signals from each wheel sensor that dont match the same rpm.
I would have thought this too. I have 55's on the front and 50's on the back (temporarily I might add), it doesn't disable the ABS. Feels like it affects heavy breaking slightly though. Will soon be getting 50s all round when i get some moolahh.
#30: Re: Tyre profile can i go from 55 to 50? Author: meady, Location: basingstokePosted: Tue Dec 14, 2010 8:12 am ----
Mikey2uk wrote:
If you going for 4x 50 I would recomend the Bridgestones EZ300 I have got these on mine and they are a really good tyre. I first had them on last year and have done 30k on them and have only just replaced the fronts.
The arent bad on price either. I think blackcircles.co.uk are dong them for £55 each.
you got just under 30k miles from your front tyres im lucky to get 10k out of mine
#31: Re: Tyre profile can i go from 55 to 50? Author: panason1c, Location: SomersetPosted: Tue Dec 14, 2010 8:23 am ----
roberto.f wrote:
I would have thought this too. I have 55's on the front and 50's on the back (temporarily I might add), it doesn't disable the ABS. Feels like it affects heavy breaking slightly though. Will soon be getting 50s all round when i get some moolahh.
I guess then that 55's to 50's still keeps the abs parameters within tolerance, in the same sense that if one tyre has more tread than another the rolling radius would also be different between the wheels but not enough to affect the operation of the abs.
#32: Re: Tyre profile can i go from 55 to 50? Author: Mikey2uk, Location: StevenagePosted: Tue Dec 14, 2010 8:23 am ---- No Andy over 30k on them mate
#33: Re: Tyre profile can i go from 55 to 50? Author: Locky, Location: Newcastle / PlymouthPosted: Tue Dec 14, 2010 9:35 am ----
Mikey2uk wrote:
If you going for 4x 50 I would recomend the Bridgestones EZ300 I have got these on mine and they are a really good tyre. I first had them on last year and have done 30k on them and have only just replaced the fronts.
The arent bad on price either. I think blackcircles.co.uk are dong them for £55 each.
Not seen the EZ300s anywhere yet, but cheers for the heads up.
Ive almost managed 30k out of my 17" Pzero Neros!
#34: Re: Tyre profile can i go from 55 to 50? Author: Mikey2uk, Location: StevenagePosted: Tue Dec 14, 2010 9:46 am ----
Locky wrote:
Mikey2uk wrote:
If you going for 4x 50 I would recomend the Bridgestones EZ300 I have got these on mine and they are a really good tyre. I first had them on last year and have done 30k on them and have only just replaced the fronts.
The arent bad on price either. I think blackcircles.co.uk are dong them for £55 each.
Not seen the EZ300s anywhere yet, but cheers for the heads up.
Ive almost managed 30k out of my 17" Pzero Neros!
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im lucky to get 10k out of mine 
