ive got 195/45 15 tyres on my motor. it hasn't been lowered or nothing, but the ride feels really harsh on the back end. i.e. i can feel every single bump. do you think if i put 195/50 15 on the back it would feel a bit softer? or maybe even 205/50 15? also, i'm just about to service it. what oil do you think i should use. i was thing 10w40
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The 'correct' profile (i.e. closest to original rolling radius for speedo purposes) for those rims would be either: 185/55 15 or 195/50 15. You are correct that a higher profile introduces more compliance into the tyre and improves ride so the former with a 55 profile will be the largest gain.
I've used 5w40 fully synthetic in mine for the past 10 years with no problems.
I've used 5w40 fully synthetic in mine for the past 10 years with no problems.
My tyres are 205/50/15 no problems with them 
And regarding oil I use 10w40 part Synthetic, I change my oil fairly often so no point in me using fully synthetic. x
And regarding oil I use 10w40 part Synthetic, I change my oil fairly often so no point in me using fully synthetic. x
I use 10w40 part synthetic Castrol GTX Magnatec.
And I'd also say that 195/50's would be your best bet.
And I'd also say that 195/50's would be your best bet.
195/45/15... bit of an odd size... are you sure that's what should be on there, did they come as standard, or part of an aftermarket wheel/tyre package?
The rolling diameter of a 195/45/15 tyre is 556mm. To keep the same rolling diameter, but increase the profile, you'd be looking at 175/50/15 tyre, which is the same 556mm rolling diameter. Again, this is another odd size.
195/50/15 sounds more likely, and this size tyre is actually cheaper too (and you'll have much better choice of makes/models of tyre).
The 195/50/15 has a rolling diameter of 577mm.
The rolling diameter of a 195/45/15 tyre is 556mm. To keep the same rolling diameter, but increase the profile, you'd be looking at 175/50/15 tyre, which is the same 556mm rolling diameter. Again, this is another odd size.
195/50/15 sounds more likely, and this size tyre is actually cheaper too (and you'll have much better choice of makes/models of tyre).
The 195/50/15 has a rolling diameter of 577mm.
Ive got 195/50/R15 tyres on my wheels. I had 13 inch steelies on when i bought the car but swapped them for the alloys. The 195/50/R15 wheels and tyres are still within the + or - 2.5% of the rolling circumference or whatever it is. I used one of those calculator things on the internet to work it out.
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