there actually are radials for MC's now, but they really are a modified radial. (never used them) We had an EML conversion sidecar on our 1200 which had a different set of wheels and we had radial car tires all around. Like the M3W, a sidecar does not lean. Went from wearing out tires every 6-8k to 30+k

Rodger
2018 M3W "Dreamers on the Rise"
2004 Plus 8 (wife's)
old Goldwings and a couple of Harleys