Installation of Single Chainring Instead of Triple

I never quite accepted the concept of two sets of gear shift levers - front and rear. The drivetrain gear ratio is a single number - why does it have two tunables? Why do I have to keep in mind the multiplication of two numbers? Why should there be “forbidden” combinations of front/rear cogs? Finally, why do I need to carry a triple chainring with a granny gear which I only use three times a year? Most of the time, it turns out to be a bad idea anyway.

I do understand technical limitations and requirements to provide huge gear ratio variation. But the concept as a whole and its details never appealed to me. Besides, being a single-speed bike owner, I do not feel like there is need for an over-engineered system to make my life “easier”. When even a single gear ratio is enough, three-by-ten gear ratios sound insane.

So when I learned that there is a definite trend to getting rid of front derailleurs on mountain bikes and substituting them with as single front chainring, I was happy. Surely, a wide cassette is a price to pay for reduction of gear ratio offered by the front triple. What I have on my GT is not very wide, but there are still ten cogs. I looked through the Net sources, learned of a possibility to go from a 3x10 system to 1x10, and decided to give it a try on my existing setup. Several photos of the conversion process follow.

Shimano Deore crank with all three chainrings removed. I was too lazy to unmount the pedal; it was not in the way anyway. The smallest 24-teeth star was attached to the spider with its own four bolts. The middle 32-teeth and the big 42-teeth ones were connected together through four 104mm BCD holes in the spider with bolts.


One more view of the spider. All eight holes for the bolts are visible.IMG_20160720_130613

The new chainring is a 38 teeth one from Raceface. Below its rear side is shown. The ring turned out not to be completely symmetrical in regard to the bolt holes.IMG_20160720_131301

The front view on the chainring. Too much of visual branding noise to my taste.IMG_20160720_131311

The chainring attached to the spider. A special set of bolts of different length were required, as well as spaces that came with it. This is because now these bolts are to hold a single ring, not a pair. If I have had used a bash guard in place of the biggest ring, the spacers would not have been required.IMG_20160720_131954

A close-up view on the bolts. The rear part is kept by 6 mm Allen key, and the front side is tightened with a 5mm key.IMG_20160720_131959

Rear view close up.IMG_20160720_132008

The new chainring installed on the bike. I have to note that I shortened my chain by four links: the previous biggest ring had 42 teeth, and the new one has 38, that is four teeth less.IMG_20160720_144012

One last close up on the new ring.


Unfortunately, I still have not got a chance to ride the new setup as I am still recovering from crash.

Written by Grigory Rechistov in Uncategorized on 28.07.2016. Tags: chainring, race face, raceface, shimano, single,

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