Have anyone used these kinds?
Is there a risk that those could stuck too tightly because of
1.) heat,
2.) corrosion (metal to metal),
or
3.) dirt?
How about if putting some oil on those?
I have used them in the past. No problems with them on the bike, but the thieves was another story. I think they lasted about 3 weeks before somebody helped themselves to them.
2 Likes
I’ve also used metal dust caps without a problem. Not branded ones so they didn’t get nicked. It’s usually me who loses then first.
All that unsprung weight ruining the handling! 
2 Likes
Never bothered with the branded, nickable ones but both the Transalp and Street Triple have metal caps - no problems so far.
I think it’s spelled ‘nickel’. 
2 Likes
Not if you live in Liverpool …
4 Likes