Have for years mounted on 4 MTB`s such frequency counter and Everything always ... Somehow went to fly a pedal crank of fixed magnet, which is why I ordered this set again. Here I found that the magnet (block) has thickened considerably and due to this no longer fits, it is this is just not enough space between the pedal crank and swingarm (MTB of mine) ... In this respect, the article for my situation has changed adversely and is no longer compatible (as before). Do not understand why you have to change it in such a little meaningful magnetic Klotz. The thinner, space-saving variant has fulfilled all the purpose bikes, especially since still supplied with an adapter, which ensures that the magnetic poet comes to the sender. So watch ... Product does not fit any when pedal crank and rocker are close together Normally value = 5 stars. Here, I give time due to little thoughtful change = 2 stars.