[ant]

hi guys,

i have a 2GS and have some 19x9 and 19x10 Work wheels on the way for it. they are +27 front and +24 rear.

i am going to roll/shave the rears and hopefully not have to do much to the fronts. i intend to run 225/35 front 245/35 rear tyres. i considered 235/35 for the front but not sure if it will be too bulky for clearance?

Anyway my problem is that i would prefer to keep a tyre that is the correct load rating for my vehicle, or as close as i can get. it is hard to find a tyre shop here in Perth, Western Australia to do the stretching, let alone get them to commit to a tyre if it isnt the right load rating.

now the car is a daily and travels about 40min to and from work a day, at least 60% of this at 100km/h freeway speeds. so this also has made me mindful of trying to get a good load rating.

i also dont really want to have to go for a super expensive tyre cause they will get chewed out by the stretch and the camber anyway!

i have found some 235/35 (no 225/35 yet) in 91Y rating (Nexen and Nankang), and some 245/35 in 93Y (Nankang also).

So my question is, what is the go with the load ratings? do other people try to stick to them? how much leniency is there in them really?

i did some research on a local tyre shop website and found out that 91Y and 93Y tyres are rated at something like 600kg max load/tyre and 615kg max/tyre respectively. This averaged out works out that their max load is around 2430kg. Now i checked and the weight of my car Tare is 1600kg and Kerb Wieght (which i believe load ratings are based on) is 1680kg.

So, if i get tyres load rated to an average of around say 600kg per tyre meaning 2400kg, if my car is 720kg below this is this a safe level? bearing in mind due to my ride height i pretty much dont drive with many people in the car any more, and even if i did that would be say 5 people (full car) at average of 100kg each still leaves about 220kg to their maximum.

Any insight on this would be much apprecaited. i have seen others on other forums running mroe/same stretch and much less load ratings (in mid 80s) but i would rather err on the side of caution due to the daily driver aspect and the speeds i do day to day.

cheers
Ant

Mesca

iTrader: (28)

Yup, you're pretty safe, you're not even close to the load rating maximum

Byprodrive

iTrader: (1)

91Y & 93Y are speed ratings which are affected by weight.

Load rating is a simple weight capacity based on the amount of air you can put in a tire which is what supports the weight of the car. Tires sold in the US have the load rating in Lbs molded in the side of the tire & it is PSI dependant so when you raise air pressure you raise load capacity up to max rated PSI for that tire which is dependant on sidewall construction. If you run a bigger tire you can safely run a lower, more comfortable PSI.

If you exceed rated load capacity of the tire it can lead to sudden failure (blowout) & it will void the warranty. Higher speeds also lower load capacity & that is what the 91Y refers too

[ant]

byprodrive - thanks for your explanation. i do understand that the letter refers to the speed rating. my stock tyres are W rated so Y is a higher speed rating, so i guess as you point out that is a factor in lowering the load rating.

also i know that the load rating convert to weights, that is what i was saying in regard to 91 being 615kg (or 'x' lbs for you guys in the US) and then 93 being 630kg.

Im saying that those 91 and 93 load ratings allow me around 750-800kg of spare load rating. so i am asking if this is considered enough as the stock safety net for the 2GS on my placard works out to 1000kg, but then other larger high performance locally made sedans i have looked at are load rated with a safety net of around 800kg, which is what i would end up with which to me seems reasonable.

to exceed that, i would need to have a full carload of heavy *** people, along with a load of luggage totalling 200kg or so!

CK6Speed

iTrader: (1)

That answers your own question. Provided your calculations are correct, if you don't plan on having a full carload of heavy peopleand a load of heavy luggage, than you have more than enough headroom and are within the safe range.

vwynn

iTrader: (4)

91Y-93Y = 1356 lbs (91) - 1433lbs (93).

times 2 for both and add.. = 5578 lbs max.