BikeMaster TR6 Tube – Multiple Sizes Available

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BikeMaster TR6 Tube 2.75/3.00

Most riders don't think twice about inner tubes until they're stuck on the side of a trail pulling a tire off in the dirt. At that point, you start wishing you'd put a better tube in. The BikeMaster 2.75/3.00 TR6 is a natural rubber tube with seamless construction and a heavy-duty valve stem. Comes in five rim sizes — 12, 17, 18, 19, and 21 inch — so it covers everything from a small trail bike to a full-size dirt or street machine.

What You're Actually Getting

The material is natural rubber. That matters more than it sounds. Synthetic and butyl tubes are cheaper to make, and you'll find them in a lot of budget tubes. Natural rubber is more elastic, it handles the heat that builds up during a long ride better, and it doesn't get brittle the way some synthetics do over time. When you're seating a tire, it also stretches more evenly — less fighting with the bead, less chance of pinching the tube during install.

Construction is seamless, meaning there's no joint running around the circumference of the tube. That seam — on tubes that have one — is always the first place things go wrong. Pressure and heat cycle through it every single ride, and eventually it gives. Seamless avoids that problem entirely.

The TR6 valve is a straight metal Schrader stem, 8mm diameter. It's reinforced at the base where the stem meets the rubber — that's typically where stress concentrates and cheaper stems crack over time. Works with any standard pump or CO2 inflator. If your bike currently has a TR4 stem, those two are interchangeable, so no issues there.

Features & Benefits

Natural Rubber Tube Lasts longer than synthetic alternatives, stays more flexible across a wider temperature range, and holds up better under the stress of regular riding. Whether you're putting miles on a road bike or hammering a dirt track, the material gives you a reliable foundation.
Heavy-Duty TR6 Valve Stem Metal Schrader valve, 8mm straight stem, reinforced where it meets the tube. Compatible with standard pumps and CO2 inflators out of the box. Interchangeable with TR4 if that's what you're running now.
Seamless Construction No seam means consistent rubber thickness all the way around. Consistent thickness means consistent strength. It's a better tube from the ground up, and you'll notice it in how long it lasts compared to cheaper options.
Reliable Daily Performance This isn't a race-specific tube or a specialty product. It's a well-made everyday tube that holds air, handles normal riding conditions, and doesn't make you think about it — which is exactly what you want from an inner tube.

Available Sizes & Part Numbers

This listing covers the full 2.75/3.00 width range across five rim diameters. Pick the one that matches your wheel.

Size	Rim Diameter	Part Number	Typical Use
2.75/3.00-12	12 inch	374607	Small trail bikes, pit bikes, mini motos
2.75/3.00-17	17 inch	374628	Street bikes, dual-sport rear wheels
2.75/3.00-18	18 inch	374634	Enduro rear wheels, classic street bikes
2.75/3.00-19	19 inch	374640	Dual-sport front wheels, older road bikes
2.75/3.00-21	21 inch	374645	Dirt bikes, enduro front wheels

To find your size, look at the sidewall of your current tire. It'll show something like 2.75-17 or 3.00-21. The last number is the rim diameter — match that to the table above. The tube handles both the 2.75 and 3.00 widths, so if your rim diameter matches, you're covered.

Vehicle Fitment

2.75/3.00-12 Small off-road bikes and pit bikes with 12-inch wheels. Covers most 50cc to 125cc pit bike rear wheels and mini trail bikes.
2.75/3.00-17 One of the most common rear wheel sizes on the road. Fits a wide range of 125cc to 650cc street bikes, standard/naked bikes, and dual-sport models with a 17-inch rear rim.
2.75/3.00-18 Found on older Japanese standard bikes, some classic cruisers, and certain enduro rear wheels. If your rear tire shows an 18-inch rim size with a 2.75 or 3.00 width, this is your tube.
2.75/3.00-19 Common front wheel size on dual-sport and enduro bikes. Also shows up on some older road bikes. Check your front tire sidewall if you're unsure.
2.75/3.00-21 The standard front wheel size for off-road and enduro bikes. Most dedicated dirt bikes and enduro machines run a 21-inch front rim. This tube covers that across both 2.75 and 3.00 tire widths.

Quick Specs

Brand	BikeMaster
Tube Width Range	2.75 / 3.00
Rim Sizes Available	12", 17", 18", 19", 21"
Valve Type	TR6 — Straight Metal Schrader (8mm)
Material	Natural Rubber
Construction	Seamless
Color	Black

FAQ

How do I know which size to order?

Check the sidewall of your current tire. The size is printed right on it — something like 2.75-17 or 3.00-21. The last number is your rim diameter. Match that to the size options in the table above. If your tire reads 2.75 or 3.00 for the width, this tube covers both.

What's the difference between TR4 and TR6 valve stems?

Both are 8mm straight metal Schrader valves. The difference is a slight variation in the rubber base where the stem meets the tube — TR4 has a small oval rubber transition, TR6 doesn't. They're interchangeable in almost every real-world application, so if your current tube has a TR4 and you order TR6, it'll work fine.

Why does natural rubber matter?

A lot of budget tubes use butyl or synthetic rubber because it's cheaper. Natural rubber is more elastic, more heat-tolerant, and generally lasts longer under regular riding conditions. It stretches better during installation too, which helps you avoid pinching the tube when you're mounting the tire.

Can I use one of these sizes as a spare to carry on the trail?

Yes, and it's worth doing if you ride off-road regularly. An extra tube, a couple of tire irons, and a CO2 inflator is a simple trailside flat kit that takes up almost no space in a bag. The individual packaging keeps the tube clean until you need it.

Does this tube work for both road and dirt riding?

Yes. Depending on the size you pick, this tube fits everything from street bikes to enduro machines. The natural rubber and seamless construction hold up in both environments.

My bike currently has a tube that's a slightly different brand — will this fit the same way?

As long as the size matches (rim diameter and tire width), yes. Inner tubes aren't brand-specific — they just need to match your tire and rim dimensions.

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