Ive been riding on the road on magteks for at least the last ten years, also tracking them along with 20+ year old hrc and marchesini magnesium rims on my RS250. It's also worth noting that NSR magteks are not pure magnesium, unlike the HRC RS250 rims. I haven't so far experienced any problems.
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Proud Father of , 05 ktm 400exc supermoto 2018 honda crf rx supermoto