Smooth bearing movement and the fit on my carbon fork was perfect.
925232
Its a headset, what more can you ask of it?  Smooth bearing movement and the fit on my carbon fork was perfect.
1816086
Between Jagwire's Youtube install video and their written instructions they install was fairly simple, taking me less than an hour to install a rear disc brake and run the cable/housing (and I'm very new at bike maintenance).  The quality seems high, and the carbon color is pretty cool with my matte black frame.  I still need to do some adjusting to the brakes, but I think the cord and housing are great so far.
4966548
Not sure how much criticism one could give a stem but this product it quite well made, fit perfectly on my carbon bars and looks good.
830253
These are good quality bearings. There is not much more to say other than they are in spec and run smoothly.
608107
Just what I needed, it worked perfect on my 80cc bicycle.
4175294
A great replacement for the barrel twisters that my bike came with. Smooth and accurate, these levers have served me well. They are easy to use and easy to install.
3988565
This bearing fit right and worked out great.

It's the (larger) inner pinion bearing. For whatever reason, the common parts stores I checked with around here, listed the outer race but the actual bearing itself was either not listed, or was the incorrect part. Anyway, this bearing/race combo from Amazon WAS the correct part. Shipping took longer to get than most items, but I had other projects I could attend to. The price was great too.
2398961
I was pleasantly surprised to find that this tool was so robust. Fit the fork perfectly and did the job well. Not much more to say beyond that.
3257748
I chose these pedals due for my 29er so that I could clip in or just jump on and go. My old GT had baskets on the pedals and I had been using them since the 90s. When riding "unclipped" with the baskets they would drag. The Shimano pedals have the same ground clearance whether you're clipped in or not.

During my first ride I set the release fairly light. This was a good choice as when I did have to un-clip it was easy and confidence inspiring. Adjusting the tension is easy to do on the trail as needed.

These were just what I was looking for for the riding that I do here in the Maine woods.
1256939
Bolted right up to my 1 1/8" fork, and as I mention it is one of the few 25.4 stems that fit my handlebars.  No slip on this bad boy.
3784365
My order arrived in a timely manner, considering I ordered 2 different items and had them shipped at the same time.  The bearings are smooth and will do what I purchased them for. B
360
Item fit my 2005 CBR600RR as described. This is the heavier 525 Chain and Steel rear sprocket. Fitment was right and the bike feels much better. For those of you wondering if a steel rear sprocket "will slow you down" it will by milliseconds on the track. Steel is stronger and will last longer. D.I.D. chains are renowned and the steel sprockets are the bonus in this kit.
795908
Bought this to work on an older Fuji frame that used the older 1" threaded headsets. Fits the nut perfectly and has excellent torquing power and durability. Pedal wrench was an extra bonus.
2764273
This worked great for my Di2 conversion. I have a carbon seat post so I was looking for a safe way to hold the battery. Easy to install and very secure, this type of design should have been the default method from Shimano instead of the metal clips.
3039736
SKF has been a trusted brand for many years, this bearing and hub assembly fit perfectly and has worked great so far (the past 4,000 miles). I expect I'll get another 100,000 or more miles out of this one (as long as the vehicle holds up). The hub unite came well packaged and one time, thanks to "prime".
4917968
I used this bearing to mount a 100 pound concrete wheel for a pottery treadle.  Works perfectly and the measurements are accurate.  The bearing runs smoothly.  No complaints.
1682308
I used these to replace the original Shimano shifters on an old 90's MTB and they've worked out very well.  Smooth operation all around.