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I had a chance to buy a set of Slappy trucks the other day, just the normal ones, 8.5 width and have had half a dozen sessions on them now.
As others had said, top bushing takes a beating, so swapped out top washers, now back on originals after the bushings have worn in, as well as trimming up all the bits that were coming out.
The bushings sure did firm up a lot from the first session, to the second and third - didn't expect that quite so much, so even put a thin flat washer on the front for a session just to see and it brought them back to very carvy, which was nice.
The main thing I wanted to check was the kingpin height, which is only 33 mm from the baseplate, which is the most interesting thing to me. Indy, Thunder and Venture all have kingpins that stick up about 35 mm, with Ace sticking up between 37 on Classics to 38 mm on AF1 trucks. In a world where even a few mm counts for a lot, a difference of 5 mm in kingpin height is pretty wild to me. I am used to angle grinding down my Indy kingpins and using low top bushings, so having something like that as stock was good.
Overall they skate really well and I am happy to have them, even though I will still skate Indy on pretty much everything, as well as having boards with Thunder, Venture, Ace just to have a mix up every so often.
Definitely a well made and good feeling truck to me.
Slappy bushings:
Top 9 mm
Bottom 13 mm
Total with stock washers 25.5 mm
* Given this thread is already up to page 18, this is probably not at all new info, but the kingpin heights alone were the most interesting thing to me, compared to the other brands of trucks.