I started off with a suction mount with a string safety line which works fine. I then changed to Veho VCC-025-LPM MUVI mount for the roll bar. More peace of mind with a secure mount. I use it with a Sony Action Cam. It has a standard tripod thread. You need to tighten the swivel nut well as I found the camera slowly tilting down.

http://www.amazon.co.uk/Veho-VCC-025-LPM-Extra-Large-Handlebars/dp/B00CBSDS2G

Do not buy the Veho VCC-AO17 which is too small for the roll bar despite many suppliers still describing it as 5 cm x 4cm diameter. I bought one but it would not fit. Supplier took it back but would not refund postage relying on Veho description. I contacted Veho & they admitted description was wrong & changed their web page to 3.3cm dia. Refereed back to supplier & they then refunded postage.

Tim.