The block does a good job of securing the front wheel and providing a stable platform. However, it's not tall enough to level the road bike I've used hooked up to a Blackburn trainer. The only way to get a comfortable riding position is to stack a good thick phone directory underneath the stabilizer ... the older style, really thick and wide phone books work best. 3 stars

I'm glad I got the Trak Block along with the Bicycle Trainer. They really should be sold together. Without it the bicycle is running downhill and it is very hard to stay on it. 5 stars

This is a great addition to the basic trainer. Adds a little incline to the level equipment for added work. 5 stars

This is a must have, clearly better than a phone book or 2x4. I'm not sure if there are cheaper ones out there (there probably are), but this one works great! 5 stars

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. 2 stars