Federal 595 RSR

[amgmcqueen]

Does anybody know what the difference is between the two federal 595 rsr tyres in the link below? Are they available in different compounds, the cheapest being the hardest?

Also does anybody have any experience of driving these tyres on the road? I have heard they have a very stiff sidewall similar to a runflat? I will probably be driving 50/50 road and track. Thanks.



https://www.camskill.co.uk/m118b0s670p0/Track_Day_...