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Btwin 500, Smartphone Holder

Sale price: $12.99 Regular price:

Soft, easy to use smartphone holder: mounts onto the handlebar stem using a strap with a rip-tab fastener. Foam on the back to protect from impacts. The very supple pocket fits the size of the phone.

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Sale price: $12.99 Regular price:

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San Francisco, 735 Market St. Options

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Model: 8385553

Product Features

Btwin 500, Smartphone Holder is designed for We have designed this holder as an easy, reliable way of storing your smartphone on the stem of your bike.

Soft, easy to use smartphone holder: mounts onto the handlebar stem using a strap with a rip-tab fastener. Foam on the back to protect from impacts. The very supple pocket fits the size of the phone.

A photo of the Btwin 500, Smartphone Holder in use


Can be mounted onto any stem. Max. smartphone dimensions: 3.1" x 6.3"


Protection from dust and drizzle (non-waterproof pocket)


This soft pocket takes the shape of your smartphone in order to hold it well.

Item protection

Foam on the back to protect from impacts.

Easy assembly/dismantling

Tool-free assembly using a secure rip-tab.


Protective touchscreen.

Easy to read

The pocket covers the phone completely while leaving the screen visible.

Product Customer Reviews

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1306 Reviews
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Btwin 500, Smartphone Holder,neon lemon lime
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Just the right size

I was actually looking for a way to mount my phone on my top tube. Between my bike computer and headlight, there really isn't much room on my handlebars/stem for my phone. I don't like my phone bouncing around in my back pocket. I tried a top tube bag but found it too big and my knees would brush against it while riding. It took quite a bit of searching to come across this product. The case can be attached to my top tube and is very secure. There is an additional safety strap to make sure that the velcro does not accidentally become undone. That's a nice little detail. My Samsung Galaxy S8 fits perfectly in this case. It's narrow enough that my legs don't hit it even when I'm out of the saddle. The plastic is touch sensitive, so you can use your phone while in the case. However, you can't really use the side buttons. It is a little bit difficult to pull your phone out of the case. The trick that works well for me is to slide a stiff piece of cardboard between the plastic cover and your phone screen before pulling the phone out. As noted in the description, the case isn't 100% waterproof. I haven't used this in the rain yet, so I can't comment on how well it keeps the water out. The stitching on the side of the case was starting to unravel when I received the case, so I had to run it through my sewing machine to reinforce the stitches.

Good product

Practical, easy and simple

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Fits iphone xs tightly

Serves it purpose, but not the easiest to use. Good quality and the touch screen works. Siri on iPhone doesn't work, but i would have hoped that it should. Some kind of a small slit at the back would have been a better design rather than having the phone sit so flush that the Mic doesn't pick up voice. Quite happy but could have been better.

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excellent piece of equipment, fits a large smart phone, and the touchscreen still works through the protective cover.

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Not a great product

Difficult to get in and out of the holder. Doesn’t stay on the bike frame well. A clunky, poorly designed product

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Velcro not strong enough

At first I was happy with this as it's easy to attach and fits my phone with no problem, but after a few uses, the velcro is not strong enough and it has fallen off in the middle of the road several times in the last week, one time resulting in a cracked screen.

Phone holder

Fell off second time of using. Velcro not good. Had a refund.

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Excellent service. Good quality item

Nice bit of kit but too small by about 15-20mm for my smart phone.

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500 Smartphone Holder

I originally bought the BTwin 500 smartphone holder for a previous Samsung S7 phone and it fit perfectly, However, now that I have upgraded to the Galaxy Note 9, the insert is a tad too small, snug at best, and difficult to get out. Despite all that, I have lived with it and the actual holder is very secure. You attach it to the bike stem with the thick velcro fastening, then a further secure fastener fastened opposite way, over the large velcro to hold it all in place. The see-through case allows you to use the phone too and keeps any small drops of rain away. I still highly recommend this product, even bought another one for my son.

Take a moment

I read the reviews prior to purchase and was a little concerned to hear tales of the holder falling and a phone being damaged, but given the balance of comments overall I decided to go ahead. Please note there are two securing Velcro straps, when both are used my case and phone are rock solid. I'm very happy with this product but it takes a few moments to put in on securely.

Nice phone holder

The downside is it is hard to retrieve the phone. A sling that able to help pull up the phone will be helpful to take the phone out. Also it is a bit overpriced. Mind to reduce the price a bit.

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Sturdy and secure

Sturdy and secure Velcro fastening. Couldn't use the touch screen phone though.

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Keeps falling off

Worked fine at first but then started falling off. Phone has hit the road multiple times.

Hello. Thank you for the review. Can I double check please that you have used the second small security strap that comes with the holder? You wrap the big strap around the frame or stem and then secure it with the smaller stronger strap. I hope this helps.

MICHAEL, Road Cycling Leader, DECATHLON
dropped off the bike, phone destroyed

Initially, I was very happy with the product until one day the velcro decided to give in without any sign of wear and tear and the holder dropped off my bike at a busy crossing and fell under my rear wheel - my IPhone 7 got completely damaged and I needed to get a new one. The velcro material used is of poor quality although initially it seems quite strong, it doesn't resist the pressure it is under when you strap on the holder to your bike.

Thank you for taking the time to give us feedback regarding the phone holder. I'm sorry to read that it came away from your bike. I will forward this on to the team in charge of this item at b'Twin. In the meantime, please contact our customer loyalty team on 0207.064.3000 regarding your telephone.
Peter, Cycling Manager, DECATHLON
Hold all my calls!

It seems great so far, especially considering the price.

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Additional Product Information


Main fabric

  • 100% Polyester cationic


  • 100% Thermoplastic polyurethane


With DECATHLON COACH, you can measure your SPEED, know about the DISTANCE you covered and view your GPS ROUTE: all stats close to hand. FREE mobile app available on AppleStore and GooglePlay.



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Size Guide Visual