Hi there!!! So I'm new to bikes and I've got a little problem I've run into!

I recently bought a rokform bike mount for my iPhone (https://www.rokform.com/cart/Rokbed-v3-Bike-Mount-Kit.html) However, I have a quill stem and it won't fit (it says that it has to be installed on any 1-1/8" thread-less steer tubes). I bought a different quill stem that had a cap and I thought it would work, but that didn't work either. So, I'm looking for a way to convert to the headset and stem method. I live in downtown sac, so most of the area I ride around is flat, so I'm not a super heavy rider. Mostly ride between 5-15 miles at a time. Not looking to spend more than $50 to convert it. I currently have a threaded tube, please let me know what I need! Please include links to parts if you know of any. I'm sorry if this doesn't make any sense, I'm new to this so I don't know all the technical names of things.


The tube is 1-1/8" here's what it looks like without the quill stem installed.
https://i1265.photobucket.com/albums/...9/c0588d14.jpg

And here is what it looks like with the quill stem installed (it's usually up a little higher, i just wasn't tightened in the picture).
https://s1265.photobucket.com/albums/...t=dbb87132.jpg


Thanks for looking!

you need one of these https://www.nashbar.com/bikes/Product...2_175545_-1___ , and one of these https://www.nashbar.com/bikes/Product...2_174797_-1___ to make this work . from the look of your photos it a 1 " not 1 1/8 " stem . but i could be wrong .

I am glad you are so sure. But I think you are wrong. If you look at the spec sheet for the mount (took a bit of finding 'cause the OP's link doesn't work), it seems to need to screw into the star-nut in a threadless steerer. The stem adapter linked does not have a place to screw in a bolt, and the existing bolt in the adapter needs to be torqued down tight to hold the wedge in place and keep the bars from falling off.

Edit:

There was a mention her a few weeks ago about a steerer tube extender designed to work with a too-short steerer in a threadless headset. I don't know who made it, but that might have the required place to put a bolt that would preload the headset and then (after clamping the stem bolts down to hold the headset together), remove to make space for the holder for the e-phone.

I'm pretty sure it's 1-1/8, that's the size of the quill stem I have and it fits perfectly, so I feel that if I got a 1" it would be too small.

So are you saying that the iPhone bike mount would work with that adapter?

i dont think it will.

Could this possibly work?
https://www.bicyclehero.com/us/bbb-bi...FShxQgodNzEAJQ

this https://www.bicyclehero.com/us/bbb-bi...FShxQgodNzEAJQ and this https://www.nashbar.com/bikes/Product...2_175545_-1___ are the same item . if one doesn't work then the other would not too .

I doubt it. The bolt in that one is also designed to holed the wedge in place and keep you from dying. It cannot be replaced with the bolt from your e-phone holder, and I don't think you can thread the e-phone holder into the top of that bolt.

The most obvious solution is to replace your fork, headset, and stem. This can be done for ~$100 - $150 + installation.

If you can find an adapter where there is a top bolt that is either not involved in holding the adapter in place, or is threaded to allow the M5 or M6 threads from a threadless then that might work.

The problem is that the phone mount screws into nut that only holds the cap on a threadless steer tube.

No matter what you do , that same bolt holds the entire stem on your bike regardless of the stem you adapt too.

The only way I can see that to work, and its feasable since it appears the phone mount is machined aluminum, would be to see if either the stock quill bolt (that screws into the wedge down inside the tube) is long enough to go thru the phone mount first and still have enough threads to tighten the stem...... Or maybe try and get a longer bolt that would do that.

If that makes sense.


* Basically what he beat me to saying above this post.

Ya, I tried this. But the bolts for the adapters are a lot bigger than the one that goes through the mount!

The next step would be to see if you can open the holes in the mount some ?

Worst case would be to see if a machine shop could re-make the cyclinder part of the phone mount to accept a larger screw. It looks pretty simple.

I know I could but we're not exactly neighbors.

There is another type of adapter that is made that is a piece of steel tubing with a lower diameter that fits into a steerer tube, and an upper diameter that is the same as a steerer tube so you can put a quill stem down inside. If you have one of these and the upper outside diameter is correct for clamping a threadless stem, you could put a star-nut from a threadless headset into the top of it to mount your e-phone. But then you will never be able to remove the adapter unless you drill out the star nut.

Edit: Here is an example of this type of adapter, but this one is the wrong size:
https://www.bonthronebikes.co.uk/513-471916

I thought about that. But I custom painted my bike so I don't want to get new forks.

Alright I think I understand. So if I got something like that I could clamp a thread less headset on it that would have a bolt for the cap to screw into? An I understanding they right?

You might be able to. But there are other problems with this solution. First and foremost is: I don't think that is how that adapter is designed to work. Also, as I mentioned, you will lose the ability to remove the adapter when you install the star nut. You might be able to use one of those expander plug nuts that are used in carbon steerers.


Of swap the fork and headset for a threadless one and do the job properly.

If I were you I would return the fancy phone holder and buy myself some adhesive velcro and make myself a holder.

Going to all this trouble to mount your e-phone holder is like buying car to match your roof rack.

The reason I want to keep the adapter so bad is that it is rock solid. Any other adapter I've seen is sub par.

You could just keep the phone in a pocket or a backpack.

Wouldn't it work if I just found a stem adapter with the same size bolt?

What stem is it your wanting to use, that black one in the pic?

Cause thats not going to work regardless.

Alright, well I guess I'll just return it then. Shame because it's amazing.

The only thing I could think of is to use a bolt to tighten the adapter to the black cap it comes with and then super gluing the cap to my quill stem. But that kinda takes away from how sturdy it was suppose to be.

Maybe. If it was the same size bolt and the cap-portion of the stem fist in such a way that it doesn't interfere with the top of the adapter. And, no offense, but based on the trouble you have had so far and the questions you have asked, I wouldn't trust your mechanical skills to determine if the stem is attached properly (nothing personal - there are a lot of people posing here who I would trust less - at least you asked).

If there is any question at all - keep this in mind: securing your stem to your bike should always be a higher priority than attaching your e-phone to your stem. If you settle for a sub-standard stem attachment method so you can text while riding or whatever, well... you deserve what happens.

My mechanical skills are actually pretty good, I did just build a bike from scratch without knowing anything about bikes. I just wanted to see if things were possible.

I also would never text. I just liked it because it was sturdy. I broke my old iPhone from a subpar mount before.

I wouldnt give up so quick
reconsider the issue, ignore the factt that its a headset mount
you just need a way to mount an m5 bolt someplace on your bike

how about on the handlebars?
know those old shimano rapidfire shifter pods? how about steal the mounting braket from one of those:
see example pic from the 'net: https://farm8.staticflickr.com/7277/7...89e7bc73_c.jpg
drill out the pod mount hole from m4 to m5,
mount it upside down on your bars
bolt the phone holder to it
should look really clean/elegant

I'l bet you can flip this over and bolt that phone mount to it......

https://****************/2009/11/feiso...bicycle-mount/

$39