Hi. I have a hybrid bike with 700c rims with 135mm drops (hub width) at the back. I am looking to put lighter better quality wheels onto my bike. It currently has a 7 speed freewheel on the back. Question 1. Can anyone recommend a well priced wheel set for my bike. I weigh 18 stone and my current wheels are taking strain. (Budget up to £200) Question 2. Can I change to a casette and put a 7 speed cassette on the back with a spacer? thanks in advance.