Menampilkan postingan dari Desember, 2018

Shimano Ultegra R8000 vs 6800: Brake Calipers

Although hydraulic disc brakes are becoming more popular on road bikes, traditional mechanical caliper brakes are still used on many bikes, as they are simpler to adjust for the home mechanic and also more lightweight than disc brake setups.

In some cases, it makes more sense to use caliper brakes, as they are more suitable. For example, on the Dahon MuSP folding bike, a standard reach caliper brake comes stock on the bike. This is best paired to a road shifter, which is why the Dahon MuSP is a good choice for a road drop bar setup.

During the previous generation of road caliper brakes from Shimano, a cam roller mechanism was used to enhance the braking performance of the brakes. This can be seen on the Dura-Ace 9000, Ultegra 6800 and 105 5800 caliper brakes.

This time, the new Ultegra R8000 brakes were used on the Dahon MuSP. Although it looks quite similar to the previous Ultegra 6800 brakes, there are some subtle but important differences. Let's compare and see what the difference…

Polygon Cozmic CX3.0: S-Ride 1x12 Speed, Maxxis Tires, ODI Grips

It has been 5 years since I bought the Polygon Cozmic CX3.0 mountain bike, and some components are way overdue for a change! For example, the tires are still the stock Kenda tires, and it is definitely time to change it after 5 years.

At the same time, I decided to install the 12 speed S-Ride upgrade kit, just to see how a 11-50T cassette feels like. As shown in detail in the previous post, this 11-50T 12 speed cassette can fit on a standard 9 spline freehub body, which means it can be installed on the my stock Shimano MT55 26" wheelset.

For the choice of new tires, there is not such a wide range of 26" tires available, as the market has mostly moved on to 27.5" and 29" wheels. Still, the range is wide enough to make it a tough choice to choose a new tire. After much research, I finally decided on the tires shown below.

I needed to take into account the tire width, as the latest generation of 26" tires are normally wider than the stock Kenda tires which are only …