The standard set up on most of XC cranksets is 22-32-44 and usually 11-32 ratio on the rear casette. This was the exact set up also on my bike. If you think about it the 22-32 ratio is as easy as it gets and that is very light gear no doubt about that. During training and racing I'm able to cover all the climbs on the middle (32T) ring so the lightest gear I use is 32-32 (1:1).
I have been thinking about to take the small ring (22T) off since I don't use it at all and set up a double chainset.
So this project was based on my standard Shimano SLX chainset. I have removed the original rings from it.
Then I have prepared the next items that I have bought before:
The TA Specialites rings are very light and good quality parts. Also they produce chainrings in every single size and dimension known on the market. KCNC is also well known name if you looking for light parts.
The weight of the necessary parts
The next step is to fit the 28T ring on the chainset where the original small ring use to be. Then you need to bolt the 42T ring on where the original middle ring was resting. This way the chainset is all good to go, ready to be fitted.
The next important step is adjusting the front mech. First of all it has to be lowered a bit since you have 42T ring fitted instead of the original 44T. After this the cable tension has to be adjusted as well. The last thing to be done is the "H" limit srew adjustment to ensure that the front mech does not go that far as it did before.
The final step you need to do: just put the chainset back on the bike. While you doing this be sure there is enough gap between the frame and the bottom bracket cup on the drive side to ensure the 42T ring wouldn't hit the chainstay during rotation. You can adjust this with spacers between the frame and the cup.
The project is done - chainset is on the bike
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