275/40/20 on front wheels

Thanks for the guidance chaps, I’ve dropped my Leighton wheels off earlier. Gone for 245/45/20 on front and 275/40/20 on rear with Cross Climate 3’s. £1,080 fitted. Calling back tomorrow to get them put back onto my van and my 16 inch winter snotters took off.
Very jealous!
 
All those with 245/45r20 on the front and 275/40R20 on the rear, what is the gearing like? Also how much does the speedo under-read by?

Thanks
 
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