This is a great app! I’m a BMX dad with two little ones racing so I’m constantly looking for what works best for them as they grow. Before I had to carry paper print outs with the charts on them to the track, now I just carry my Iphone and I have it all right there. I downloaded it the other day and it does everything that I need it to do. The only problem I had is that it doesn’t cover the small slick tires nor does it cover the small crank sizes down to 135mm. So I jumped on my e-mail and sent my issues to JP Martineau and a couple of hours later I receive a response that it will be fixed in the next two days. So I would like to thank JP Martineau for his great product and customer support, which is what, makes this app worth the money I paid.
RobertsonBMX about Bicycle Gear Calculator — Bike Gears