Hi i have a bmw730 53 plate. It has 19" wheels. The tyres on the back are 275/40/19 and on the front they are 245/45/19. Is it ok to add 245/40/19 on the front as I need to replace the tyres or should the profile stay slightly different. If so why please?
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Sounds sick. You should try to eliminate them one at a time. So, having fitted different tyres, have you had the wheels/tyres balanced since? If NO, then that should be your first step! Once that's done (and presumably your steering vibration is cured) you will be in a better position to diagnose any remaining engine vibration.
For legal reasons the tyres on your vehicle must be of all the same profile . That is for example if you have 195- 75 15 on the car you must have all 195-75 15 on the car. You cannot have 195-75 15 on the front and 195-45 15 on the rear. IT is not just a bit smaller it lowers that rear of the car by 30mm. However it may cause the problem but I would expect it to happen in all gears . I suspect that the engine RPM's ares hanging on a bit and not reducing sufficiently for when the clutch is again for second gear. There is a large ratio change from 1 to 2 and less so for the remainder. Run fault codes to check for idle sensor/ accelerator position problem sensor.;
I really don't think you will be able to use those rims and tires, probably the biggest is going to be 18" wheels. The 8.5" rim is too wide. An 18" came as the stock size on the sport package for the Jag, it's 7.5 wide. I don't think who sold them to you really knew if they would fit or not. Without wheel spaces and raising the suspension, I don't think they'll work on the car.
This will only come on when a tyre has dropped in pressure (not spare). It work on the principle that a tyre with less air has a smaller rolling circumference and therefore a different wheel speed. This is then monitored against other signals from other wheels and determined that a loss in pressure has occured.
If all tyre pressures seem ok, there could be a chance of a small unoticeable leak and would require a bath test. This is when the tyre is dipped in water and bubbles would appear where the puncture is.
Ultimately the system may just need to be reset, or has incorrectly been reset from a tyre change. For this you just press and hold the TPC button (located on the centre console above the gearstick - looks like a flat tyre with an exclamation) turn on the ignition to position 2 and the light will come on re then yellow,go out, come back on yellow. When it comes back on yellow it re-initializing the system. You can let go of the button and after 20 odd seconds the light will go out for the final time, completing the reset.
If the light continues to come on after the reset then you definitely have a puncture somewhere!