Originally Posted by
bobbyl1966
When one tire say max pressure 90 psi what is the correct pressure i put on the tire. And tire max psi 120.
90 and 120 psi are safe inflation pressures for those tires -- high enough to prevent pinch flats and low enough that the tire can handle the pressure. You may get somewhat better ride quality at a slightly lower pressure, but finding that ideal pressure depends on a number of factors, including your weight. See the link davidad supplied above for more info.
Originally Posted by
bobbyl1966
Which rim tape is good. Because the original rim tape is had move on the side i used electric tape and duct tape but that is not working my innertube stay do pinch flat. I have double wall wheels.
Velox rim tape is good stuff, as are some other options. The tape needs to be strong and stretch-resistant to prevent the tube from bulging into spoke holes and bursting. Electrical tape is NOT strong or stretch-resistant.
As mentioned above, the tube bursting in a spoke hole is
not a pinch flat. Pinch flats are caused by underinflation. When you hit a bump, the tire gets compressed against the lip of the rim. The tube gets trapped in that pinch and gets cut.
Originally Posted by
bobbyl1966
That veloplugs i see online is better than rim tape? Is be okay if i use veloplugs and rim tape for double protection?
Veloplugs work fine, as does good rim tape. Neither is better than the other at their primary job, which is keeping the tube from getting punctured by the rim. Using both at the same time is unnecessary.