Strongly suggest you go 21" at the front. Lightnings had 21" so you can say your Comet has been "Lightningised"!! You can then use the new Avon Roadriders which are truly wonderful. You could possibly try a rear AM26 with the standard front if you want to save some pennies, I don't think it will harm the handling. I know that building a 21" stainless wheel with correct paint is very expensive here in Oz.Can anyone suggest a better combination than the Avon SM front and safety mileage rear. I have a 20" front rim and a 19" rear rim. I can't seem to find much available on the internet in these sizes.
cheers