I was repacking the bearings on my bike when I saw the bearings were shot. I purchased a inexpensive set of Shimano WH-RS21 wheels. My old wheels were Ultegra 32 spoke, and until the bearings went out after 70K miles were bullet proof. I notice the pros who weigh much less than me don't use low spoke wheels, (I'm 180# after a long winter) I haven't noticed any improvement on my times with these areo wheels, but they seem squirrely at times, I've got about 200 miles on them. Will they, especially the front collapse on me as I sometimes fear?