first of all, i really dont think that this wud damage the engine at all cause in the same rim, it isnt that wide on the road ....if it was the deluxe rim, then maybe yes. secondly, i have retained the original tube and tyre with me, so i can change it back to the stock tyre anyday i want. thirdly, my bike running is very less....from february till now it has only been run for 3700 kilometers, so i wonder by the time this tyre wud start giving troubles, my son who is in class 1 might me in matric 