A 24x3 bike tyre is a wide 24 inch tyre, but the old inch marking is not enough on its own. The safer compatibility check is the ETRTO code printed on the sidewall. For many true 24x3.00 tyres, that means 76-507: around 76 mm wide on a 507 mm rim.
Why ETRTO 76-507 matters
The second ETRTO number, 507, is the rim diameter. A 76-507 tyre is not interchangeable with 24 inch tyres that use another rim diameter, and it is much wider than 50-507 or 57-507 commuter sizes. If your old tyre is worn, look for the full sidewall marking before choosing a replacement.
24x3.00 clearance checks
A 3 inch casing needs real space. Check the fork crown, fork legs, chainstays, seatstays, brake bridge, disc brake hose route, mudguards and any rack or stand mounts. Leave room for wheel flex, mud and manufacturing tolerance. Do not assume a bike supplied with 24x2.00 or 24x2.35 tyres can accept 24x3.00 without measuring.
Catalogue-backed 24x3 options
1Bike lists exact 76-507 examples such as the Hartex XTRA ACTION 24x3.00 / 76-507 and Hartex XTRA BOLD 24x3.00 / 76-507. A nearby comparison product is the Duro Razorback 24x3.00 / 70-507, which shows why the ETRTO width should still be checked even when the inch label looks similar.
Which tube fits a 24x3 tyre?
Choose a tube whose printed range covers the tyre. For 24x3.00 / 76-507, a wide tube such as the Hartex 24x2.60/3.00 Schrader tube is a direct catalogue match. Some downhill or wide 24 inch tubes also cover nearby ranges, but valve type and rim valve-hole size still need checking.
When to choose a narrower 24 inch tyre
If the bike is used mostly on road, has close mudguards, or originally came with a narrower tyre, a 24x2.00, 24x2.35 or 24x2.60 option may be the better fit. Use the linked 24 inch category to compare exact ETRTO sizes, not just the inch label.
