So i have this problem that is driving me mad. I had a wheel with a 7 speed freewheel, unfortunately it went fubar due to my sister backing her car in the bike.
bought a nearly new sun CR-18 wheel with a 7 speed cassete on it. The said cassette is a shimano unit, looks pretty much new to me a little bit on use on it, maybe at most 200 kilometres on it. (was bought from a reputable shop and i know the mech who's in charge)
The problem is ever since i installed this wheel, it skips gear 6&7 at pretty much every pedal pressure/stroke i apply.
I have a brand new shimano chain hg-70 or something like that.
could it be those 2 cogs are a bit worn and the chain is sliding on it ?
chain is too loose and i dont have enought wrap around on those cogs ?
the derailleur is a low end shimano but always did it's job greatly up to now
can separate cogs be bought and replaced or is it better to change the whole cassette assemble ? (with a sram maybe ?)
can i use a "speed link" like the kmc or sram master/power link on a shimano chain ? the damn shimano pins are 8$ each a "speed link" is 3$
thank you for the upcomming answers and solutions