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They should have taken seconds to fit - but actually took nearly 30 minutes of trying to get them to bite the threads inside my (new) shoes. I had to take the inner liner of the shoe out, while trying to press hard against the threaded nut on the shoe from the inside while pushing in the bolt from the other side - it shouldn't have been as hard as it was. Having read the reviews - I'm not the only one to experience this. I'm fairly technical minded - and don't usually get stumped by much that involves nuts and bolts - but these were a pain in the neck.
I wondered whether these were genuine, based on the packaging, and they broke after just 100km. Correctly refunded by Amazon though, despite the seller saying no returns.
Update: I've now compared these cleats to (hopefully) genuine Shimano cleats bought from Wiggle, and I think that there are several reasons to suspect that these aren't genuine Shimano:
1. The packaging that they arrive in does not have the Shimano header card, although it is in similar blister packaging to the genuine Shimano item.
2. There are differences in the shape of the product - some of the hollows and undercuts on the hidden side of the cleat are different to the Shimano product, in particular the size of the rectangular hollow and the shape of the 2 triangular hollows on either side. There are also other smaller variations.
3. The parts are produced in a different mould tool than the Shimano ones. The split lines of the mould tool are in different places and the ejection and breath holes are different sizes, and the style and position of the reference numbers are different.
4. The bolts are a lightly different shape and are less well-made compare to the Shimano ones.
5. The overall dimensions are typically slightly smaller than the Shimano ones - only around 0.5mm typically, but there is no reason for a variation of this size in modern injection moulding.
6. The material is different. The are both glass-filled nylon (polyamide, or PA), but the Shimano ones are made from PA612 , which is stronger and stiffer than the PA12 that these cleats are made from.
Any one of these could be a genuine manufacturing variation, but with all of them combined, I think there's reason to believe that these aren't the genuine article.
Works grand - though the bolts supplied were not long enough for my shoe (reason for 4 stars) though my shoe came with many spare bolts. Although this is maybe a fault with my shoe, I kinda would have thought shimano would have either bolts long enough or 2 versions avail or something?
Amendment Been on a good few more rides and still good
These did not come in official Shimano packaging. After 2-3 rides one of the back yellow bits fell off. I thought this was bad luck but by 4 weeks later I had lost 3 and the black plastic was wearing down++. I am an occasional rider - 2 x / week at most for 1-2 hours. My suspicion is that these were counterfeit, and when I bought a new set from Wiggle in July, there are small differences, including in the colour of the yellow. The new set also came in proper packaging.