Is it off limits to ask where you can get a Tapered Roller Bearing capable of turning a whole 25,000 vehicle?
Answer to the question title and body: Yes. It is off limits.
Pursuant to David's comment on Evan's answer I'd like to bring up the topic of demo equipment and or student laboratory kit.
There are a fair number of specialized demo toys and tools for student laboratories that don't have and use or demand outside of the physics classroom. If we were going to make an exception (to the general rule "This is not a shopping advice site" that Marek proposes) this would presumably be one of them.
Example of the kind of thing I'm talking about:
- A clear plastic tube containing a nut and a down feather with vacuum valves at either end to allow a atmosphere-free Galilian-drop in the class room
- Stirling engines which will run on the temperature gradient provided by a cup of coffee
- Air-tracks and spark tables
Seems as if with no better place to ask it, and with it being directly related to physics, it should be permissible.
Why not just permit two new tags
[supplier] for questions of those sort.
[supplier]Where can I get a tapered bearing that can withstand 25,000 lbs?
[manufacturer]Where can I get a device a cheap device to demonstrate how a hovercraft works?