The thread below can be of help, assuming owner still in business.

Old Thread on Tyres (Price, sizes, etc)

@Guka. Where is he located before i give him a call?

SMS is one bob, and one bob can make a 20 seconds long call, enough to pass a query.
Some of these wazees the age of @guka cannot read those tu tiny sms'es, except the Mpesa based sms'es.

Between 29 and 35 depending on the weight of the car, weather and type of road your using

averagely you can use 32psi

Every car has those details indicated hapo kwa the "car door".

Every tyre has every important detail inscribed on it .....you only need to squat beside it for a moment. you will find Load Rating, Speed Rating, maximum allowable inflating pressure for that specific tyre, tyre size (this you know), Temperature Resistance Rating, Traction and Treadwear grading. Do not get used to that "thirty fae"..pressure limit depends on the type, besides the size, etc.

wazua a bank of knowledge