Anybody who can’t fit their tyres onto their Stans rims can send them to me for disposal. I never have any problems – in fact I can’t even remember the last time I had to use a tyre lever to fit one.
That’s the exact same case for all my Stans rims (I’ve had… 11 Stans rims), and I’ve used from the Schwalbe range, Rons, Ralphs, Nics. They’ve all been easy to get the tyres on, just by hand. Same with Conti, Bontrager, Maxxis (which were too loose for my liking), Gato, Kenda, On-one…
However, I’ve had this issue on friends’ Stans rims, and Schwalbe tyres. Which leads me to believe there are tolerances affected on both tyre’s ID and rim’s OD that vary.
Unless you’ve experienced it, I understand your apprehension and will just believe it’s user error – it’s not, I’ve fitted countless tyres to Stans rims, from most manufacturers.
I still remember painfully, a set of Nics on a set of 29er Crests were insanely tight, they went on eventually with patience, and 30 minutes later they blew off the rim in my kitchen, and broke the bead.
Stronger levers aren’t really the answer with Stans rims, they’re soft alu – if it’s really tight going on, I just would send the tyres back and get some that fit. Like I said, if you’re struggling in the workshop to get them on, that’s game over for a trail-side repair.
Anyway, it seems a bit pot luck, as I’ve not noticed a trend – it’d be interesting to get Stan’s view on what tyres they have experienced issues with including the year of manufacture.