Ok, scrubbing in tyres is really a matter of trying to get rid of the ‘release agent’ that is on the tyre from when it was in the mould.
To do this you want to get the tyre HOT, on a race bike you fit your warmers and it only takes a lap to scrub them in (<2 miles), i.e. if they have been heated, you can almost go flat out from the off!!
On a road bike (and presuming you don’t have access to warmers) I guess you will have to try and simulate this. So get out there and take your bike to some twisties. Just gradually ‘work’ the tyres, this will get the heat in and scuff the surface of the tyres.
On a nice warm/sunny day you will be able to do this whole process in say 10 miles.
I really can’t see how the 50-100 miles thing is of any use. I can’t believe that a tyre that has done 100 motorway miles is going to be scrubbed in!!! That said, it will get the tyres hot, which is half the battle here!!
Long story shot, actual mileage I reckon is pretty irrelevant, so I shouldn’t worry about trying to measure that, just ride as you normally would (lets face it you would have warmed your tyres before getting ‘on it’ anyway)!!! Having a bit of respect on the throttle when you first get it cranked over.
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