While browsing through some older photos of my Boardwalk, I realised that the Kojak tires have been on my bike for quite a while. Looking at the date on the photos, it has been 21 months since I first installed this pair of Kojak tires! Now, there are a few components on a bike that can be considered consumables, meaning that they will wear out and eventually have to be replaced. Here is a short list of these components:
1) Tires. Depending on the brand and type of tires, can typically last at least 2000km.
2) Brake Pads. Wear rate is very dependent on weather conditions and riding conditions, not so much on mileage. Brake pads wear much faster in the rain and in the city where braking is done more often.
3) Chain. Can usually last thousands of miles before stretching too much, but they are usually changed out earlier due to rust or bike upgrades.
4) Cassette & Chainring. They will eventually wear out, but it takes a lot of mileage to wear them out. The teeth will become sharp as the chain wears down the gear teeth.
Of course, actual wear rate and lifespan of these components depend a lot on riding conditions and frequency of maintenance.
For me, the cassette and chainring wear is not a problem since I have been upgrading my bike, and the Shimano Ultegra crankset and 105 cassette are relatively new. Same for the chain, switching from 7/8 to 9 and now 10 speed Dura-Ace 7901 chain. The brake pads are not so new, but the wear rate can be easily seen, and they look fine so far. Plenty of thickness and life left.
As for the Kojak tires, it is not so easy to detect wear. Unless you really use your tires until the rubber wears out and the carcass of the tire is seen, it is hard to tell that your tires are worn, especially if you are using slick tires with no treads.
My rough estimate puts the mileage of the Kojak tires at 3000+ km, probably close to 4000km. No problems with the tires so far, apart from being tight on the rims, making it a PITA to remove from the rims. This is partly due to the wire bead type of Kojak that I am using.
On the surface of the tires, I can actually see many small dots on the tires, much like the surface of a sponge cake. It is hard to estimate the remaining lifespan of the tires, but this is probably an excuse for me to change to new tires!
Besides the Schwalbe Kojaks, the other tires that I have considered are the Duranos, which are narrower and faster tires. The Duranos are 1.1" wide, compared to 1.35" width of the Kojaks. It is excellent if you are looking for pure speed, but since I do carry stuff and do some light touring with my Boardwalk, I felt that the Kojaks are still the best tires that suit my purpose. Narrow and slick enough for fast riding, and yet wide and cushy enough to handle some load and less than perfect roads. Lower tire pressure is required, which makes it less prone to punctures. In this case, there is no good reason to change to another type of tires, since the Kojaks work so well.
Small holes on the tires, a result of normal wear and tear
New Kojak tires!!! Love the smell of fresh rubber
The new Kojak tires has the words and logo printed with reflective paint, brilliant for side visibility at night.
The new Kojak logo design, compared to the older Kojak tire.
Comparing the surface of the new and old tires.
I got the Kojak tires with a Kevlar bead, which means that the tires can be folded, and the flexible bead also makes it easier to install and remove the tire from the rims. Moreover, the Kevlar version is lighter at 230g each, compared to 290g each for the wire bead version.
Together with the super light Schwalbe tubes (SV 6A), the tires and tubes weigh less than 600g in total, down from around 800g. Probably too little to feel while carrying the bike, but since these are rotating mass at the edge of the wheels, it might just make a little difference.
New tube and tire, ready to go onto the rim
Nice contrast, especially with a brand new tire!
Love the reflective words!
Close up look at the Kojak logo and the Wheelsport logo
The rear wheel also gets a new tire
I'm sure you can tell that I really like the glowing logo!