Profile Design Threadless Size Converter (1" - 1 1/8")

I'm currently in the process of building a trike out of a very old (somewhere between the 50's and 80's, I've yet to find anything on the serial number) Schwinn (at least, I THINK it's a Schwinn, lol) that had some very old tech on it. Such as a threaded headset and the old cup and ball style bottom bracket...lol, yeah, that old.So I already got myself a bottom bracket converter so I can run a normal threaded bottom bracket cartridge (which sure makes maintenance a breeze), but I was on the hunt for a front fork to replace the stock fork, as I was converting it from a 24" skinny tire trike to a 20" FAT TIRE trike (lol) and wasn't sure what I was going to have to get, stem-wise, until I found a fork.Well, I finally found myself a front suspension for a 20" x 4" fat tire (already have all 3 rims, thankfully), and since it had a 1" threadless tube, I knew I needed an adapter for the fork...which leads me to this, lol. This works in my new suspension fork beautifully! I still have to get replacement cups and bearings for the headset, as there's no way I'm re-using the old cups and bearings. I saw quite a few bearing indentations from years of riding a rigid-forked bike and smacking pot holes and curbs and whatnot.In fact, a little PRO TIP for the day is to always run a suspension fork of some kind if your bike allows for it...it not only saves wear and tear on your wrists, elbows, and shoulders, but a front suspension fork, no matter what kind, can prevent impact damage to your headset bearing and cups...the suspension absorbs energy that would otherwise be transferred to the bearings and cups, causing indents and thus irreparable damage to the bearing surface.Anyway, I have to pick up new bearings, so I don't have this installed yet, but when I do, I'll upload a pic with the new fork / wheel / tire installed on the old frame. But as I said, it works great for my application. If you're converting an old threaded trike to a threadless setup like mine, this should work GREAT for you. 5 stars.

Very happy with this peice if you are doing and old school threaded 1 inch fork and want to put a 1" and a 1/8 newer stem on your build this is the part. It's aluminum and super clean highly recommend and delivery in one day

A great way to put modern bars on an older bike. Fit and finish was good

I purchased this to update a mid 90's Cannondale M400 mountain bike. The stem fit into the head tube fine, but initially I was completely unable to get things tight -- the bolt just turned, and there was never any real tension. Upon further inspection I noticed that the included bolt is shorter than the one that came stock on the bike, and also that the little wedge piece at the bottom that expands to tighten the stem is smooth (pictured), whereas the one that came stock on my bike has ridges. I figured I would try to use the old bolt and wedge, and that surprisingly solved the problem. I've been on multiple rides and nothing is loose, so far.This could be an error on my part in terms of not ordering the right product, or in not knowing enough about my own bike, but the bottom line is that this didn't work for me out of the box. If I didn't think to mix in the old parts with the new I would have had to return this. I'm not entirely sure what sort of bike this does work for out of the box, but if you have an older Cannondale I wouldn't recommend ordering this unless you have the original parts to swap in.I would have spent more for a product made in the US, but as far as function and value for money it is hard to complain here.

Likes:Fits my bike project like a glove.solid materialvery durableamazing workmanshipConcerns:NoneKept or Returned?Kept and installed on my Fixie bike and it works like a charm.Thanks for your time and I hope this review was helpful.

This is a well-priced, good-looking aluminum adapter that lets you mount a 1 1/8" newer style stem on a bike with an older (or cheaper) 1" steering tube. Two things to pay attention to:1. Make sure that you are buying the right size (as many buyers seem surprised.) When your bike has a "1 inch" steering tube, the shaft that fits inside the stem (i.e., your old stem or this new adapter) will be thinner, about 7/8"/22.2mm. If your old stem is 7/8"/22.2mm thick, your steerer is 1" and this adapter will fit. (Your steerer is measured on its outside, but you may not be able to actually see the tube on many bikes.) If the shaft of your old stem is thicker than 7/8"/22.2mm, your steerer is not 1". Also be sure that the thicker top part of the shaft (where you mount the new stem) is correct for your new stem. This adapter takes stems that are 1 1/8"/28.8mm, a common size (though some stems are larger or smaller.)2. Unlike similar adapters, the top cap on this one is wider than the opening in your stem. You can't mount the adapter on the bike, then mount the stem on the adapter. Rather, you'll need to assemble the adapter and your new stem off the bike, then insert the combined unit into the steering tube. The payoff for your efforts is a cap that covers the joint between the stem and the adapter. That will likely keep water from seeping into your assembly and also looks more elegant.