Wednesday, May 10, 2017

Avanti Inc 3: Continental Grand Prix 4 Season Tires

After changing the rear wheel on the Avanti Inc 3, I realised that I have upgraded both the front and rear wheel on that bike. As such, both the front and rear rims have a higher profile compared to the stock wheelset. The Schwalbe Marathon Supreme tires that I have had for a few years does not seem to match so well to the high profile rims, as the tires has a reflective strip all around.

Also, after changing to drop bars and road crankset, the bike is now a more sporty bike that wants to go faster. As such, I decided to change the tires on the bike to something narrower and hopefully faster.

Having heard of many positive reviews about Continental tires, I decided to try it out instead of sticking to my usual Schwalbe brand. As an all weather commuting bike, I have to ensure that the tires have sufficient grip in wet weather, while also having some level of puncture protection. Therefore, the more race oriented Continental GP4000 is not so suitable even though it is fast.

While browsing through the wide range of tires that Continental has, I came across this Grand Prix 4 Season Tires that seem to provide what I need. Let's take a look!

Continental Grand Prix 4 Season Tires, folding version

28mm wide, for a good balance between comfort, grip and speed. The previous Schwalbe Marathon Supreme is 32mm wide.

The tire circumference is helpfully provided for programming the cycle computer. Max pressure is 115 PSI, which is high for a commuting tire.

Robust race tire due to the layers of puncture protection available.

There is a tread wear indicator on the tire, but I can't find it.

New tires!

Slick in the middle for low rolling resistance, grippy design at the sides for cornering grip

Made in Germany! I didn't realise it came with brown sidewalls though...

284 grams for 1 tire, which is about 90 grams lighter than the previous Schwalbe Marathon Supreme

After changing the tire on the rear wheel, I compared it to the front wheel to see the difference in width. However, there seems to be very little difference in width...

Rear wheel with new 28C Continental tire, front wheel with 32C Schwalbe tire.

Visually, there is almost no difference in width...

Front wheel with Schwalbe Marathon Supreme tires is 30.66mm in width

Rear wheel with Continental Grand Prix 4 Season tires is 30.04mm in width

Front wheel with Continental Grand Prix 4 Season tires is 29.02mm in width

Comparing the front wheels, the Continental tires are about 1.6mm narrower in width as compared to the Schwalbe tires. This is much smaller than the 4mm that the sizes (28C vs 32C) indicates. Seems that the Schwalbe tires were narrower than specified, while the Continental tires are wider than specified, causing this condition.

I was rather disappointed as this meant that this tire change only yielded a small difference in width, when I was expecting more. If I had knew this was the case, I would have gone for the 25C Continental tires (which might turn out to be 26mm in width).

Fresh logo on the Continental tires, as installed on the rear wheel

From far, the brown tire sidewalls are not so visible. Without the reflective strips on the tires, the rim profile looks deeper.

This upgrade turned out to be rather inconsequential as the tire width was not changed much. At least it looks quite good on the bike. After testing it out for a few months, I find that the ride quality is good and feels faster than the Schwalbe tires. However, it may be due to the change in riding posture (from flat handlebar to drop bar) that yielded the increase in speed.


  1. Your experience with the width matches up well with mine. I ran 28 mm Continental Ultra Sport IIs on my TCX, and they measured 30 mm across when inflated to 80 psi. I mounted these tires on a wheelset with 19 mm internal width.

  2. please, what was the width of the rims?
    (so that you got those millimeters is tire width)
    thank you!
    best, Mircea

    1. The internal rim width is 18 mm, as you can see from this post. This yields am actual tire width of 29 mm.

    2. thank you very much!
      best regards,

      (sorry if my question above will come again for the second time, had some problems with my computer)


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