To the "RAM-HOL-GA48 - Garmin eTrex 10, 20 and 30 support" to be able to use the bike, you need a mounting kit of RAM Mount. I opted for this. In short, the part works and I had no problem with breaking cable ties, which I quite Aatami enter must, attachment with cable ties is somehow suboptimal and for the price could there also something else to be there. Functionally, the part is in order and for the bike well enough. I have it yet "relined" with silicon, so it is not "to slip" is also used in strong vibration on the mountain. In this respect, ok - but money I had 5 points for the price / bit too much - but 4 points are also not bad.