umbyfer wrote:Rear Tire, size problem using new modern tires. I used to use Dunlop SP10 155 13 in my sprint in original setting without any problems; now the SP10 are dicontinued and replaced by the Dunlop SP Streetresponse 2. Here the problem on the rear: they are wider than SP10 about 7 mm. The "shoulder of the tire" is more round; The SP10 was straight. The consequence is that the tire touchs the rear plate supporting the spring of the suspension.
I am looking for tires with straight shoulder. Thank you for any info from your experience.
Here some pictures showing the problem of new modern tires (too round shoulders) on S4/Sprint with original rear springs.
I used to use Dunlop SP10 without any problem; when discontinued and replaced by Street Response the problem appears, still usful at the limit by SP Streetresponse and not usful by the last actual Street Response 2.
My spare tire in the car boot is Dunlop SP strettresponse when the 4 new tires on the car are Dunlop Street Respons 2. I put the two wheels down with the external face on the floor. So I put an aluminium bar L-shape straight on the internal side of the wheels. (see picture 1)
I discovered a gap of 4 mm (see picture 2 and 3 where calibre shows 6 mm minus 2 mm of the thickens of aluminium bar)!!
The scretch circle on the new street response 2 tires caused by touching the spring plate is max 1,42 mm in deep. (see the pictures 4 and 5)
it means that a difference in tires of 2,6 mm is enough to be in trouble.
See also pictures 6 and 7 showing an evident gap face to face from the two models of dunlop tires.