It keeps his phone in place even when he is on a bumpy trail.

n’t bulge on hard trails

so I can't address bumpy trails)

I was skeptical that a holder like this could keep my phone from flying away on some of the bumpy trails I

I ride a mountain bike on rocky trails with severe shocks and the mount holds a 5.7" phone steady with no problem

I have yet to try some black diamond trails but some reasonable PA rocky trails have not been an issue.

I've bounced over some of the rockiest mountain biking trails with this and the Vibrelli mount holds my iPhone perfectly.

I have yet to try some black diamond trails but some reasonable PA rocky trails have not been an issue.

I ride on some pretty bumpy trails and the phone hasn't moved at all

Works great and holds steady on the rockiest trails.

and I've been on some very rough trails

We ride some rough MTB trails and my iPhone held fast thanks to this mount

When down several bumpy trails, and the phone mount held my phone tightly.

Even riding over rocky or bumpy trails my phone stays snug in it's grip and doesn't fall out.

Love this mount, the phone stays put no matter how rocky the trail.

I took this mountain biking on some pretty rough trails in the Sandia Mountains here in New Mexico and the phone help solidly

Works great for mountain biking on rough off-road trails

More than one at a time can be used but honestly, I'm riding on roads and such, not rough trails

Its only been on a few rides (rough trails not just paved trails).

I'm not confident enough in it yet to use it on a mountain or rough trail.

I have an iPhone 8 Plus and the mount held the phone securely on moderately difficult trails

i was skeptical at first, but after mounting this on my handlebars and strapping my iphone 6 into it I went out to the bumpiest paved trail i know and purposely hit every pothole i could find to test it out.

Now I'm an older cyclist and don't ride steep trails, but for a 15-20 mile ride on grassy and slightly hilly terrain I didn't notice a wobble, nor did I lose my biking app connection

Holds phone securely with a single strap but two would be good just to be safe on bumpy roads or trails.

n’t know if it works yet.

This mount works as it is described

works as it should fits perfectly would recommend.

Works as

This broke as we were putting it on our bike

Except the ball in the ball-joint which allows the case mechanism to sit, sometimes splits apart as if not glued/assembled properly.

As you would expect, I was a little worried my phone would fall out as I enjoy cross country and some single track mountain biking, but there was no need for concern.

I wondered if the iphone would shift at all during riding, but no worries as it maintained its position throughout my first ride

Now with my Hua Wei phone I can check my progress and direction as I

This little gadget works exactly as I

Fits my iPhone 7 Plus with Otterbox Defender case just fine - very stable as I mountain bike (no frustrating jiggling)Great product - got one for my partner for his motorcycle too, he loves it too