The Fastlane is designed as a commuter/tourer, while the Roadie is your classic disc brake road bike. The Roadie has faster, more responsive steering, while the Fastlane is designed for straight-line comfort and all-day easy riding. Both frames’ tire clearance is dependent on the groupset. 1x systems can fit up to 42mm tires, while 2x systems top out at 36-38mm tires.

The new Roadie and Sport are quite different. While both are road bikes, the sport is only available with rim brakes, while the Roadie is designed for disc brakes.

The Fastlane is our touring specific rando/touring model. Ample road tire clearance combined with a thicker wall tubeset will ensure top-of-the-line comfort even with loaded bags.

Our Hyper-X gravel bike can be outfitted with rack and fender mounts for more adventurous off-road touring or bikepacking.

When Gunnar first started up, we provided what seemed at the time to be generous tire clearance for the available tires. Over time, tires of every size have gotten larger (often without changing the labeled size), and there is also general interest in bigger tires. Our records do not document stay spacing on older bikes, so it will require you to do some legwork to determine if a a tire will fit or not.

You'll need three pieces of information to answer this question:

• What kind of brakes are on the bike?

• How big is the space between the stays where the tire sits?

• How wide/tall is the tire.

Type of brakes:

Caliper brakes have limits in their design:

• Short reach brakes (39-49mm) can only fit properly labeled 28's.

• Medium reach brakes (47-57mm) can fit as much as properly labeled 35C tires without fenders.

• Long reach brakes (57-73mm) can fit up to 38C tires with fenders.

Disc and Cantilever brakes:

Cantilever brakes can support up to 60mm wide tires. , but are constrained by other factors:

• Bridge and fork height.

• Chain stay and seat stay spacing -the distance between the stays at the widest point of the tire.

Stay spacing: The space between the stays tells you how wide a tire you can fit. Ideally, there would be 6mm (1/4 inch) between the tire and the stays. if you find 50mm between the stays, you can safely fit 38mm wide tires. You can get away with fatter tires, but there's an increasing risk of messing up the paint as you go below 6mm per side.

Where to measure the stay spacing?

• 700C/29er Tires: 340-360mm from the axle.

• 650B: 320-330mm from the axle.

• 26 inch: 305-315mm from the axle.

We don't have complete data on tire clearance for older Gunnars, so it's best to measure your bike rather than make assumptions on the tire that can fit.

Measure the tire: Tire manufacturers label tires to meet a market need. They seem not to want to be seen as selling undersized tire. As a result the labeled tire size doesn't match the actual tire size. For example, Continental GP 4000 28C tires measure 31mm wide, meaning that it won't fit under 49mm brakes. So find out the actual width before you buy.