Then, Kelvin from Gee Hin Chan offered me a price for the Ultegra 6700 crankset that I simply couldn't refuse. In fact, the price is very competitve compared to CRC! And the Glossy Grey colour looks so fabulous. Although I know I don't really need an Ultegra crankset, but then the poison is too strong to resist! Argghhhh....
Distinctive lines of the Ultegra crankset!
Left side crank
170mm for me!
The polished finishing is superb.
It looks so good! I love the Glossy Grey colour scheme
Nice flowy lines...well done product designers!
The reverse side of the Hollowtech II crankset
Closeup on the 39T chainring and the hollow outer chainring
Well positioned sub spikes and main spikes on the rear side of the hollow outer chainring. The rough surface really helps when upshifting from 39T to 53T.
Chainring bolts are screwed in from the rear side! And Torx bolts are used instead of the regular hexagonal head bolts.
Right side crank and chainrings separated!
Raised crank arm spider increases stiffness, they are hollow at the rear so weight is not increased
Cross-sectional view of hollow outer chainring! It is made of 2 layers bonded together, makes it very strong but lightweight since it is hollow inside.
Removing the current Shimano 105 5600 crankset. See how the cable for the FD is routed!
Different left crank cap for Shimano 105 5600 and Shimano Ultegra 6700. The new ones has a bigger thread diameter, which is shown on the right.
Ta-da! Ultegra crankset installed. Very easy as it the bike already has a Hollowtech II BB. Just pull out the old one and insert the new one!
No more gold chainring bolts, but it still looks nice!
Closeup view of the Ultegra crankset and the 105 FD
View of left crank
View of the full bike!
The Dahon Boardwalk X20-R on the Boardwalk
Not only does the crankset look good, the shifting performance also feels much better! Previously, when I upshift, sometimes the chain does not shift properly, either it shifts very slowly or it does not shift at all. Not very ideal, but I didn't complain because I hardly need to shift, unless I encounter steep slopes that require me to downshift to the 39T chainring.
Now, the shifting is practically instantaneous! It is much better than what I expected. Push the lever and it climbs up effortlessly and almost instantly. Front shifting has never felt better! This also dispels my belief that the LitePro FD adaptor that I am using is too flexible to give good shifting.
I think there are 3 main reasons why the shifting is so much better now:
1) Better FD alignment. I realised that the FD alignment was not perfect, which may have contributed to poor shifting performance. This time, when I installed the Ultegra crankset, I took extra care and time to position the FD properly.
2) Extra large ramps and spikes on the rear side of the hollow outer chainring. Also, the rough surface at the back of the chainring. Together, they catch the chain very well during upshifting and makes the chain go onto the 53T chainring easily and accurately.
3) Excellent compatibility between the Ultegra 6700 crankset and the Dura-Ace 7901 chain. The 7901 chain has a special profile on the inner and outer plates that interact with the chainrings and cassette sprockets to ensure good shifting. By upgrading to the Ultegra 6700 crankset, it fully maximises the chain's profile and consequently provides excellent shifting.
Needless to say, I am very happy with the new Ultegra crankset! Not only is the price reasonable, the appearance is excellent, it has also improved the front shifting tremendously! If you are interested in the weight, you can check it out over at the Weight Weenies blog post.