Tyres: swapping Michelin Diamaris rears to Latitude sport3

[cooa99]

HI guys,

I currently have Michelin diamaris all round which are rated at 107V. The rears are down to 3mm while the fronts are 7mm


I was thinking of changing to the Latitude sport 3 which are rated at 111W.

Since I would only be changing the rears(... front when they wear down which could be in a year or more...), Would there be an issue in having front an rears of different thread pattern and speed rating?