I have Castor Tyre 3.00-4 on my BM copy, and another chair with tyre 2.5 - 4. BOTH having a lot of problems with tyres exploding Tyres and inner tube, so want to Eradicate any possible causes.
You are buying cheap chinese made junk tyres.
I never had a 3.00 tyre explode or fail in 26 years of abuse. They will wear down to the tube and burst if you drive far enough and I have done that plenty of times. Why? Because the BM2/BM3 chairs dont much care! They are fine to get to the pub with a flat destroyed front caster tyre! I have ignored it on occasions for a day or so until new tyres turned up.
What kind of mileage do people get from this recommended tyre, before replacing? Any other recommendations about what point to replace?
It all depends. But with a *lot* of use, maybe I wear them faster than the vast majority of people do. And I get through 3 sets a year or so depending at what point I decide they are "worn". Which is usually long after I got my moneys worth! You can swap them out when they look a bit worn. Or leave them until they literally wear right through to the tube! The difference in milage is huge! Best to replace when they show signs wear. Rather than to keep going until they rival kojak. See image of one of my "worn" ones below! It burst because theres a place the tube actually poked through the tyre!
so with the carers I have been carefully checking what they inflate them to, and I know for certain they haven't gone above the recommended psi. I've been taking them up close to the PSI for better steering around the house. How close to the maximum inflation do people go?
What do you call "maximum" pressure? Depending on chair, anything between 10 psi and 30psi for me.
I also put the green gunk in.
It's not so bad in the slow chair, but at 9 mph I cannot afford to be getting blowouts. LOL
9mph is almost parked. If you got a blowout absolutely nothing bad happens. In fact you dont even need to stop. Just continue on your trip. Steering is a bit harder but you can still drive fine. If you need to have air in your casters, or if they need to be at a high pressure then the chair isnt programmed properly.