OLD 7 speed bikes may be a different spacing. If you own a bike made in the last 10 years, nothing to worry about. If it's a mid 90's bike - then you might need to measure.Can a 7 speed hardrock be changed to 8 or 9 speed cassette? If so, what would be required, and if not, how come? Is there anything wrong with 7speed?
No real reason the change it until it wears out or breaks.Ok, I was referring to a 2012 specialized hardrock disc 29er. It shows that it comes with a 7speed rear, is there anything 'wrong' with that and should I change it out? I saw an upgrade someone posted that is good for that bike, and it was like 89$, and was the front 3 chain rings/gears (not sure on all this terminology yet) and the pedal brackets and i guess the bearing that goes through the frame? I think this is called the drivetrain, or bottom bracket? What Would I need to change all of this, any recommendations? I am mechanically inclined (I am an automotive technician, with my degree in auto repair) but am not sure of all the bike components yet and what is what. I have no problem with changing it out myself though.
You need an 8 or 9 speed right hand shifter, an 8 or 9 speed cassette, and an 8 or 9 speed chain.Can a 7 speed hardrock be changed to 8 or 9 speed cassette? If so, what would be required, and if not, how come? Is there anything wrong with 7speed?