I'm going to be very specific to be as useful as possible to anyone looking at them. The first bike he rode was a Signature Schwinn MESA 20" Series 7 speed I bought at a local bike shop. I'm specific as Schwinn makes 2 separate lines and I'm not sure of the dimensions are the same. I checked the frame part first and although I didn't use a caliper it seemed to be a little over 1" maybe it's just my aging eyes. I checked it then and it seemed relatively parallel to the ground. Like that wide it's good.Ordered an item and it arrived first thing this morning.I opened it up and there are all the parts.Looking at the shape of the post I decided there should be rubber between it and the frame .I guessed as much, and I had an old Otterbox case that I cut out a piece for each brace.I would either find a piece or order a stick on it if you don't want to scratch the bike.There this is for a 20 inch bike, I hope he uses it without training wheels for a few years, I wanted to protect the finish a bit. The product appears to be well made, it looks like it is made from cold rolled, stamped and formed steel. The bolts look decent and the included nuts are of the nylon lock type. Remember that you need to check nylon nuts frequently to make sure they aren't loose. For those unfamiliar with nylon nuts, nylon is a nut insert, a steel nut. The tires have plastic hubs as you can see in the picture but feel solid. When they wear out, a pair of spare wheels is still significantly cheaper than other geared training wheels. I got them for less than $30 with Prime shipping. Others are in the $75 range. Now for the install. Read the manual. Do one wheel at a time. First I rode the railroad. After removing the bike nut and tightening the supplied extension nuts, both 15mm, I lined things up to set the height. I ended up using the second longest setup on the frame piece and the larger of the two wheel holes. The included screws have a hex head and come with a hex key. I believe the frame and lug nuts are 12mm but I seem to have a habit of not going back to that size so I grabbed a pair of channel locks to hold the nut when tightening the bolt. Then I tried it on again and found that the post lags behind the frame a bit despite the rubber in between. So I bent them a little more than I needed for tension when tightening. I was expecting this as these are not bike specific items and to be honest if I had removed the washer that was on the bike I probably wouldn't even need to do that. Once that side was firm and it seemed like nothing was moving, I did the other side. This side didn't need to be bent, it fitted perfectly. Now for the test drive. My son, who is six but has little time to ride his bike, rode it around the block. One of the reasons training wheels are needed is the speed this bike needs to go at to compensate for its small size. I couldn't keep up and he wasn't trying. The wheels worked well although there was no wear on the concrete. I have no idea long term reliability as I received them today but if they fail quickly I will update them.
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