20S - Installation on a Schuberth C3 or C3 Pro Helmet Sena November 17, 2016 01:06 Follow Have more questions? Submit a request 6 Comments Date Votes 0 Bob Wilson February 17, 2016 20:25 Thanks for the video! I was told by some that this couldn't be done but did so prior to seeing the video.............should be mentioned that the helmet surface needs to be cleaned with alcohol prior to applying the fixture to the helmet. Good video-thanks again, very helpful! 0 Sean Donnelly May 25, 2016 17:27 I would be *very* careful about using the glued surface mounting adapter. I tried using it on my Sena C3 Pro. The pad staying attached to the helmet wasn't the issue, I prepared the surface and attached the adapter. No problem.However, after only 1 ride, where it rained some, the Sena clamp fell off the adhesive pad, which was still very firmly attached to my helmet. It left a sticky 2-sided tape like backing on the Sena clamp, which does not appear to be at all adequate for holding the weight of the clamp, microphone and 20s unit. Removing the adhesive pad from the helmet, however, proved to be a lot of work. It stuck *very* well to the helmet and took a lot of work to get off. The weak link to the adhesive pad isn't the pad to helmet bonding, it is the pad to the Sena clamp. Use at your own risk. I wouldn't trust it to hold up if it failed after exactly 1 ride, which included about 30 mins of rain. 0 Sean Donnelly May 25, 2016 17:28 Correcting to my above comment. Schuberth C3 Pro helmet. Can't seem to edit comments 0 Sean Donnelly May 25, 2016 17:32 To better explain, this thin 2-sided tape backing is all that hold the Sena clam to the adhesive rubber pad. IMG_2539.jpg 0 Dave Wilson September 26, 2016 14:38 I believe there used to be a video posted here, but now I do not see it. I found one in German, on YouTube, which was sorta helpful considering that I don't speak the language. It would be helpful if Sena would put their video back up, or more helpful still if they'd post written instructions with illustrations. The German version shows an odd thing being done with the rubber spacers that come in the kit, which I believe is inaccurate. The original Sena vid (now missing?) had a better story about those. I just installed my 20s on a second C3 Pro, after an accident ate the first one, using the Sena 20s Supplies Kit. My 20s survived quite a wreck, apparently in large part because the double-sided adhesive pad is a "weakest link" - it came apart during the wreck, presumably when some force was applied to the clamp, allowing the 20s (still in its clamp) to rotate away from the helmet. While I wish the overall design were a little bit thinner, I appreciate that it did separate. That may have saved me some personal injury and did seem to save the 20s, even though the bike and the helmet were a total loss. One less thing to replace! I found the adhesive pad to be reliable before the incident but appreciate the posts above. 0 Rick Morrow October 07, 2016 17:09 I thought the video was excellent. A few areas were lacking detail, such as... 1. Two Velcro pads need to be installed for the microphone. The long oval one I put vertically between the ear indent and the red snap. The Velcro that looks like at the very front of the helmet with the arrow pointing to the back. I then used attached the back of the microphone to the long oval loop and used the extra microphone clamp to secure the microphone near the front of the helmet 2. I also spread the speaker wires apart about 2" before putting the neck roll back in place. made installation easier and I believe it put less stress on the speaker wires. Article is closed for comments.