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

Product ID: 257020489

Details

Brand
IRC Components
Item diameter
2.75 Inches
Material
Rubber
Valve type
Presta
Wheel size
21 Inches

🔧Presta TR-4 valve with secure hardware

🛡️3x thicker for max durability

🚴‍♂️Fits 2.75-3.00 inch tires perfectly

€ 86.81

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Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Tougher Tubes, Smoother Rides — Don’t Get Left Behind!

VALVE YOU CAN TRUST - Robust TR-4 Presta valve with reinforced stem hardware for leak-free performance
PRO LEVEL RELIABILITY - Loved by 900+ riders with a 4.7-star rating—join the elite cycling community
RIDE LONGER WORRY LESS - Heavy-duty construction drastically reduces pinch flats and punctures
PRECISION FIT FOR 21 INCH WHEELS - Optimized size ensures seamless compatibility with your ride
BUILT TO BRAVE THE ROUGHEST TRAILS - 2-3x thicker rubber resists abrasion and impact like a pro

The IRC Heavy Duty Tube 2.75/3.00-21 with TR-4 Presta valve is engineered for serious cyclists demanding durability and reliability. Featuring rubber 2-3 times thicker than standard tubes, it offers superior abrasion resistance and impact absorption. Designed for 21-inch wheels and tire widths between 2.75 and 3.00 inches, it ensures a precise fit. Trusted by hundreds of riders for its robust valve hardware and reduced risk of pinch flats, this tube is your go-to upgrade for rugged trail performance.

Specifications

ASIN	B0031793WA
Bike Type	Road Bike
Brand Name	IRC Components
Compatible Tire Width Maximum	76 Millimeters
Compatible Tire Width Minimum	70 Millimeters
Customer Reviews	4.7 4.7 out of 5 stars (906)
Item Diameter	2.75 Inches
Item Width	2.75 Inches
Manufacturer Part Number	T20076
Material Type	Rubber
Model Number	T20076
Size	26 inches
UPC	182682856417
Unit Count	1 Count
Valve Length	533 Millimeters
Valve Type	Presta
Wheel Size	21 Inches

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€ 86.81

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Slovakia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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1 month ago

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