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Bicycle Chainsets & Bottom Brackets


Do you want to know more about chainsets and bottom brackets?

Chainsets and bottom brackets are responsible for transferring the strength of the cyclist to the chain, which in turn transfers it to the rear wheel of the bike. They consist of one or more chainrings attached to the cranks at the end of which are located the pedals. There is one crank for the right leg and one for the left and they are mounted at 180 degrees from each other, joined by the bottom bracket.

Chainrings are a set of cogs that are responsible for making the bike chain move, transmitting the movement to the rear wheel through the cassettes. There are different sizes of chainrings to increase the drivetrain force and therefore adapt the gear to the different conditions of the terrain being cycled.

The bottom bracket can be described as the heart of the bike, since it is one of the most important parts of the bike, although it is not spoken so much about since it normally cannot be seen. Almost all bottom brackets are airtight and with the joints sealed, they are assembled under pressure and cannot be disassembled, but they can be greased to improve their performance.

These brackets do not allow for much maintenance or repair, which is why if they break,you usually have to replace the entire chainset.


Opinions featured in Bicycle Chainsets & Bottom Brackets

Shimano XT M8100 1x12v BOOST Cranks 52 mm Black
Looks fantastic!
I’ve not had chance to fit or use the cranks yet, but presented nicely and look like they’ll do perfectly.
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SRAM DUB English Thread BSA 73/68 mm Bottom Bracket Cups
Like for like replacement
The first one I had only lasted 6 months of Irish Winter riding. Hopefully this will last longer over the Summer.
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SRAM GX Eagle DUB BOOST Direct Mount 32D Chainset Grey
Crankset 32 chain ring
Does the job for me
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SRAM DUB PRESSFIT MTB 92 mm Bottom Bracket Cups
Decent quality BB
Seem fairly good these dub BB's last one did 1800 miles in poor UK conditions so a massive improvement over the old SRAM stuff
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Left Hand Crank with 4iiii Potentiometer for Shimano Ultegra R8000 Black
Good quality
It met my requirements
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SRAM X5 GXP 9V 175 44/32/22 black cranks
Good quality
Recommend for Mtb bike
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SRAM BB GxP Team 73-68 mm English Thread MTB/Road Bottom Bracket Cups
Good quality
Recommend for Mtb bike
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Shimano XT M8120 12V SUPERBOOST 55mm Crankset Black
The best bar None!
Don’t need to say much more....it’s XT it’s works brilliantly and looks amazing
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Shimano UN-300 BSA 73X122 Bottom Bracket
Satisfactory
It is a good brand
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Shimano UN-300 BSA 73X122 Bottom Bracket
Great square taper bottom bracket
Very nice quality and super smooth bearings.
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Complete Group SRAM NX Eagle 1x12V BOOST DUB Plate 32D
Good value
The cassette is quite heavy. I've swapped mine out for aluminium instead. Otherwise good quality
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Shimano Claris R2000 170mm 8 Speed Chainset 50/34
Claris chainset
Usual Shimano quality ideal for a winter bike
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Shimano Claris R2000 170mm 8 Speed Chainset 50/34
Tops for items and on time delivery
I would highly recommend for fast and quick dilivery
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Shimano Claris R2000 170mm 8 Speed Chainset 50/34
Good quality
Installed it and looks great and works well
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Shimano XT / SLX MT800 C Bottom Brackets C: 68/73
Usual great Shimano quality
The installation adaptor thing is a bit annoying, but you only fit and remove once so not a huge issue.
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