Listing says "standard" and "heavy duty". Which is it?????

I wondered the same, it seems to be thicker than a standard tube by a fair amount. It is a good quality tube, especially for the price.

Will this fit a mh90-21 Avon cobra chrome tire ?

Yes it will it will fit any 21inch. I have the Dunlop harley tire and it fits fine.

Where do you put the two nuts?

One nut goes at the base of the valve stem inside the wheel, the other nut should NEVER be used against the rim on the outside. It should be up against the valve stem cap.

Will this tube work for 90 / 90 - 21 ?

Yes, 2.75 / 3.00 / 21 is the same as 90/90-21

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🛞 Ride Tough, Ride Confident: The Tube That Means Business

ABRASION RESISTANT ARMOR - Designed to resist wear and tear, perfect for rugged trails and urban commutes alike.
BUILT TO LAST TWICE OVER - Experience 2-3x thicker tube walls that outlast standard options, keeping you rolling longer.
IMPACT ABSORPTION MASTERY - Absorbs shocks and bumps effortlessly, protecting your ride and enhancing comfort.
PERFECT FIT FOR 21 INCH RIMS - Optimized sizing ensures seamless installation and peak performance on your bike.
VALVE STRENGTH YOU CAN TRUST - Engineered with reinforced valve stems for reliable, leak-free performance every ride.

The IRC Heavy Duty Tube (2.75/3.00-21, TR-4 Stem) is engineered with 2-3 times thicker walls than standard tubes, delivering exceptional durability and abrasion resistance. Featuring reinforced valve and joint strength, it offers superior impact absorption for a smoother, more reliable ride. Weighing 550g and designed for 21-inch rims, this tube is the ultimate upgrade for cyclists demanding toughness and longevity.

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Manufacturer	IRC
Brand	IRC
Model	Heavy Duty Tube - 2.75/3.00-21 - Tr-4 St
Item model number	T20076
Manufacturer part number	T20076
OEM Part Number	T20076
Rim Diameter	21 Inches
Item Weight	550 g

IRC Heavy Duty Tube - 2.75/3.00-21 - TR-4 Stem T20076

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