Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Very tough to install

I worked on this for a while, and couldn't get the 2nd side of the tire against the rim. I brought it to my local bike shop, who said they couldn't either.It might've worked with a 20x1.95 tire (I was trying on a 1.75).Anyway, tough to do. The bike shop said they charge $30 to lots of people who can change a normal tire but can't do these.Steve