Confused about Tyre sizes - Renault Laguna

termon8r

I have a 02 renalt laguna and recently changed my alloys and tyres with a garage up the North.

I received a a decent price for a full set from a recommended supplier.

They tyre sizes are 205/40 R17 H84 which are low profile.

In the garage they assured me that they have fitted these on loads of Lagunas but now I am not sure as they look very small.

Is there anyway I can check if these are suitable for this model?

From a driving perspective they seem grand, a little rougher on the road which is expected I suppose with low profile.

colm_mcm

I think the standard size on a Laguna is 205/55 R16

205/40R17 has a smaller outside radius than the originals and in my opinion are too small.

215/45R17 would have been much better, they have a minutely smaller outside radius than the original wheels, and whilst being slightly wider, wouldn't scrub the wheelarches.


xxxxxxxxxxxx Radius Diameter Circumference Revs/Mile Difference
205/55-16 4.4in 12.4in 24.9in 78.2in 811 0.0%
205/40-17 3.2in 11.7in 23.5in 73.7in 860 -5.7%
215/45-17 3.8in 12.3in 24.6in 77.3in 819 -1.0%
205/50-17 4.0in 12.5in 25.1in 78.8in 804 0.8%

I wouldn't be happy.

BrianD3

That wheel /tyre combo does sound a bit off. The standard renault alloys are either 205/55 R16 or 225/45 R17

termon8r

Thanks guys for your help.
I am extremely annoyed with myself for not researching this before I made the purchase.
In fairness I trusted these guys as they have a good reputation and the Saturday I was there there was no room in the car park for all the cars!
I have called the manager and discussed it at length with him but he insists that they are fine.
Do you think I will get away with them or do I need to change them?
I was hoping to sell the car soon and this probably will not help.

colm_mcm

it's not a case of getting away with them, the ride quality is worse than it should be, you're putting other components under strain, you'll be using more fuel due to the diufference in gearing, and I doubt they look good on the car.

ji

You'll be grand,Change back to the original size when there worn out if your still worried about it.

Paddy001

Jus let them wear out and then put on 205/50s or mayb 205/45s, dont go 215 as you say its rougher on the road so dont go any wider with the tyres

termon8r

I have sent a letter of complaint to the suppier but not sure if it will be of any use.

Probably the best thing is too wear them down and replace them with tyres with more depth, as suggested.

Will know for the next time

colm_mcm

to be fair, it'll take ages for a full set to wear out. I'd be complaining, using the recommended size as back-up. it's more than obvious that the outside radius is much smaller than the original spec, and is throwing your speedo reading out, causing you to use more fuel etc.

I wouldn't let this go. any monkey could figure out the tyre size for your Laguna, you seem to have got someone who either wanted to offload a particular size, or didn't know what they were doing. THey are the incorrect size for the vehicle, therefore not fit fore the purpose intended.

Top Dog

Paddy001 wrote: »

Jus let them wear out and then put on 205/50s or mayb 205/45s, dont go 215 as you say its rougher on the road so dont go any wider with the tyres

Why would you advise someone who has a wrongly sized set of tyres to replace them with another wrongly sized set? He'd still have the same issues with rolling diameter, extra wear on components, and an inaccurate speedo. Sorry but that advice is just stupid to me.

Factory size as pointed out by BrianD3 is a 225-45 tyre on the 17" rims. Its an awkward/expensive size but worth sticking with the proper spec.

sundodger5

just to give you another argument, what was the speed rating and load code of the orignal tyres, if you dont know what i am talking about it is the 2 numbers and a letter after the 17 (16 originally?) on the tyre.
the smaller tyres will probably have a lower weight carrying capacity than original therefore not suitable.
do not accept the old they'll be fine or we have put them on other cars argument. just because they have done it before does not make it right.

mickdw

Top Dog wrote: »

Why would you advise someone who has a wrongly sized set of tyres to replace them with another wrongly sized set? He'd still have the same issues with rolling diameter, extra wear on components, and an inaccurate speedo. Sorry but that advice is just stupid to me.

Factory size as pointed out by BrianD3 is a 225-45 tyre on the 17" rims. Its an awkward/expensive size but worth sticking with the proper spec.

You are kind of wrong.

ok, so factory is 225/45/17

He suggested 205/50/17 which is very very close in terms of rolling radius so this will not cause inaccurate speedo. These tyres would be kinder to all components by having alittle more give in the side wall. They are just a bit narrower and not as nice. Im sure many drivers would go for the 205/50 option though.

My own car had 245/40/18 tyres from factory and I had to replace fronts with 225/45/18 as it was brutal to try to steer it on uneven roads. Again rolling radius close to original.

Paddy001

Top Dog wrote: »

Why would you advise someone who has a wrongly sized set of tyres to replace them with another wrongly sized set? He'd still have the same issues with rolling diameter, extra wear on components, and an inaccurate speedo. Sorry but that advice is just stupid to me.

Factory size as pointed out by BrianD3 is a 225-45 tyre on the 17" rims. Its an awkward/expensive size but worth sticking with the proper spec.

and how long have you been selling tyres? 205/50 would be the same rolling radius, the difference is about the same as a bald or new tyre. I would fit 205 because it has less road contact and should be smoother and put less strain on other components, the sidewall height is the samd between the two but the narrower tyre should be better. 225 may have been a standard spec, but for irish roads 205 would be a better choice.

Top Dog

Paddy001 wrote: »

and how long have you been selling tyres? 205/50 would be the same rolling radius, the difference is about the same as a bald or new tyre. I would fit 205 because it has less road contact and should be smoother and put less strain on other components, the sidewall height is the samd between the two but the narrower tyre should be better. 225 may have been a standard spec, but for irish roads 205 would be a better choice.

I fail to see what selling tyres has to do with anything? Anyone with a computer and the slightest bit of internet ability can quickly find out all the necessary information - but thats going off topic so I'll leave it.

I will agree that the 205-50 would be the same rolling radius. I will also concede that the slightly higher sidewall might make for a more comfortable ride.

However, in your original post you also suggested a 205-45 tyre, in which case my argument still stands on that alternative.

cL0h

Top Dog wrote: »

I fail to see what selling tyres has to do with anything? Anyone with a computer and the slightest bit of internet ability can quickly find out all the necessary information - but thats going off topic so I'll leave it.

Hey could you do a bit of research on the Internet and finish my PhD for me. Cheers!

Top Dog

cL0h wrote: »

Hey could you do a bit of research on the Internet and finish my PhD for me. Cheers!

How much are you going to pay me? :pac::D