See spec sheet.

Tires

Cowboy 4: 44-50 mm possible, wide tires to be kept.

Cowboy 2/3 : up to 48mm possible on the bike BUT not wider than 42mm possible with Cowboy mudguards
Minimum width 25mm

Schwalbe Marathon plus size 40-584 and size 42-584 are both compatible

On V1: 47 mm max (but watch out for mudguards clearance)

Inner tubes

See relevant saved replies: 

C4: 

Brands usually mention several widths of compatible tires (e.g. 40-584 and 47-584). Simply make sure that 47mm is included in the range of compatible widths with a diameter of 584 mm.

C2/C3:

We can recommend you both the Schwalbe SV21 27.5" Presta and the Schwalbe SV12 26" Presta inner tubes.

Other inner tubes will work too. You need to pick a model that matches the size of your tires, i.e. 42mm-584mm or 1.65"-27.5" for the original Cowboy tires, and have Presta valves. It is not possible to replace those valves with Schrader valves as they aren't suited for the Cowboy rims.

Because in certain cases the rubber can expand, don't be surprised to see that 26" models can also fit 27.5" tires (e.g. the Schwalbe SV12 26" Presta inner tube is compatible). Also, brands usually mention several widths of compatible tires (e.g. 40-584 and 47-584). Simply make sure that 42mm is included in the range of compatible widths.

C1:

We can recommend you the Schwalbe SV12 26" Presta inner tubes.

Other inner tubes will work too. You need to pick a model that matches the size of your tires, i.e. 35mm-584mm or 1.38"-27.5" for the original Cowboy tires, and have Presta valves. It is not possible to replace those valves with Schrader valves as they aren't suited for the Cowboy rims.

Because in certain cases the rubber can expand, don't be surprised to see that 26" models can also fit 27.5" tires (e.g. the Schwalbe SV12 26" Presta inner tube is compatible). Also, brands usually mention several widths of compatible tires (e.g. 35-584 and 47-584). Simply make sure that 35mm is included in the range of compatible widths.

No, the current rim is not a tubeless compatible design. An easy way to tell a rim is tubeless compatible, is to look at the inside surface of the rim. If there are holes, its obviously not airtight. Tubeless wheels also require special valve stems, which create a seal on the inside/outside surface.

Technically it is possible to convert our rim to a tubeless one with a specific kit (you need a specific valve and and rim tape to cover the nipple holes. However this is a difficult operation, which requires special tooling - not everyone can do it.

We strongly advise against it - should a client want extra puncture resistance, buying puncture-resistant tires with inner tubes (e.g. Schwalbe Marathon) is a much easier option.

We count the number of turns a wheel does. We have a value for the wheel radius and based on that we can know the distance travelled. If the customer changes his tires for tires that have a different size, the computation of the speed and distance will be slightly off.

You could use the Hexlox inserts on the front axle and the new hex bolts in the rear. There cannot be a thru axle on the rear wheel.

Pretty straightforward, we just need to follow the right instructions to get the puncture repaired.

Root cause:

• Fast puncture (customer felt quick deflation) = Snake bite → need to approach curbs carefully.

• Slow puncture (customer came back after a couple of hours and saw tire was flat) → reduced with new liners and new tires

Generally speaking, keeping the tires well inflated helps to prevent punctures. The correct pressure depends on the model, it is provided in the user manual (available at https://cowboy.com/pages/downloads)

Cowboy 4 punctures

We are aware of potential issues with earlier C4 wheels which could explain punctures in the first km, beyond the "usual" cases: 

• Rim tape not properly applied. See picture on the side: the rim tape should stay within the edges, like in this picture-> replacement of rim tape required

• Sharp edge inside the rim, left after the production process. This sharp edge should be on the part that isn't covered by the tire, replacement of rim (wheel) required.

• Valve core loose, ie. the core inside the valve of the inner tube. --> Replacement of inner tube required.

Models impacted: all

Symptom: 

• Either a spoke came loose, to the point where it can be turned by hand

• Either a spoke is completely detached and/or is broken

Root cause: accident or normal wear on older bikes (eg. a spoke can break when you hit the rim pretty hard).
This is definitely maintenance-related, not under warranty. 

Countermeasure: 

• In case a spoke came loose: it can be tightened using a spoke wrench of the right size. The wheel may need to be trued afterwards, see specific explanation on wheel truing above.

• In case a spoke broke or fell off: it needs to be replaced.

  • First check that the rim isn't damaged around the spot where the spoke broke. If it is, the wheel needs to be replaced (replacing an entire rim is a lot trickier). 

  • If the rim isn't damaged: 

    1. Arrange for a part shipment: 

       • We can ship the correct spoke based on bike model and location. There are 4 spoke lengths on each model: front left, front right, rear left and rear right.
         The spoke length on the left and the right of each wheel differs by 2 mm, so if we are just replacing one spoke, we can use the equivalent spoke for the other side of the same wheel and compensate through spoke tension. However, the length of spokes between front and rear wheel are very different.
         In other words: you can use a rear left spoke instead of rear right, or front left spoke instead of front right, but not a rear left instead of front left. 

       • We'll also ship a spoke nipple for each spoke sent, for the correct bike model. The nipple only needs to be replaced if it is damaged, but it is better to ship it to be on the safe side.

       • As said above, this is normally not under warranty -> Customer should pay for these parts (though they are quite cheap) and for the mechanic time.

    2. Get the new spoke attached to the wheel.