Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Is this necessary?

I purchased the block because it was recommended to go with an indoor trainer. I received my indoor trainer and love it, but not sure why I need the block. I thought it may be to hold the front wheel steady, but it seems fine without a block. Looking at the block I decided it must be to raise the front wheel up, but my wheel does not need raising. I quess some people need the block, but it is not for everyone.