Shimano BB-ES300 Bottom Bracket - Octalink (Size: 68x121mm)
The Shimano BB-ES300 Octalink Bottom Bracket is made to give you smooth pedalling and reliable performance on both road and mountain bikes. With Shimano’s Octalink 8-spline design, it creates a strong connection between your crankset and bike frame. This means less flex, better power transfer, and a more efficient ride. Octalink Interface is an 8-spline axle for a secure fit and improved power transfer. Sealed cartridge design keeps dirt out for long-lasting durability. Smooth Bearings reduce friction for easier pedalling. Compatible with Shimano Octalink cranksets and works for road, MTB, and trekking bikes.
The Shimano BB-ES300 Octalink Bottom Bracket is made to give you smooth pedalling and reliable performance on both road and mountain bikes. With Shimano’s Octalink 8-spline design, it creates a strong connection between your crankset and bike frame. This means less flex, better power transfer, and a more efficient ride. Octalink Interface is an 8-spline axle for a secure fit and improved power transfer. Sealed cartridge design keeps dirt out for long-lasting durability. Smooth Bearings reduce friction for easier pedalling. Compatible with Shimano Octalink cranksets and works for road, MTB, and trekking bikes.
The Shimano BB-ES300 Octalink Bottom Bracket is made to give you smooth pedalling and reliable performance on both road and mountain bikes. With Shimano’s Octalink 8-spline design, it creates a strong connection between your crankset and bike frame. This means less flex, better power transfer, and a more efficient ride. Octalink Interface is an 8-spline axle for a secure fit and improved power transfer. Sealed cartridge design keeps dirt out for long-lasting durability. Smooth Bearings reduce friction for easier pedalling. Compatible with Shimano Octalink cranksets and works for road, MTB, and trekking bikes.
The Shimano BB-ES300 Octalink Bottom Bracket is made to give you smooth pedalling and reliable performance on both road and mountain bikes. With Shimano’s Octalink 8-spline design, it creates a strong connection between your crankset and bike frame. This means less flex, better power transfer, and a more efficient ride. Octalink Interface is an 8-spline axle for a secure fit and improved power transfer. Sealed cartridge design keeps dirt out for long-lasting durability. Smooth Bearings reduce friction for easier pedalling. Compatible with Shimano Octalink cranksets and works for road, MTB, and trekking bikes.
in 17 offers
The lowest price for Shimano BB-ES300 Bottom Bracket - Octalink (Size: 68x121mm) right now is $27.86 at Lordgun.com.au, compared across 17 retailers.
The all-time low was $10.00 on 8 Apr 2025 — today's price is 179% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 9 Sept 2026.
Last updated at 09/09/2026 16:27:27
Shimano BB-ES300 Octalink bottom bracket Width 121 mm
Delivery $40.82
BB-ES300 BOTTOM BRACKET/ HOLLOW-TYPE -68 x 121mm
Delivery between 15–17 Sept $9.95
BB-ES300 BOTTOM BRACKET/ HOLLOW-TYPE -68 x 121mm
Delivery between 15–23 Sept $9.95
Shimano Bb-es300 Octalink Bottom Bracket - 68 X 121mm
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Shimano BB-ES300 68x121mm Hollow-Type Bottom Bracket
Delivery between Fri – Wed $9.90
Shimano BB-ES300 68x121mm Hollow-Type Bottom Bracket
Delivery between Fri – Wed $9.90
SHIMANO BB-ES300 BOTTOM BRACKET 68X121MM HOLLOW-TYPE
Delivery between 12–17 Sept $18
Shimano BB-ES300 Bottom Bracket - Octalink - 68x121mm
Delivery between 15–21 Sept $10
SHIMANO - Acera BB-ES300 Bottom Bracket Black BSA 121mm 24mm 68mm
Delivery $50
Shimano BB-ES300 Octalink Bottom Bracket 68mm / 121mm
Delivery between 16–24 Sept $10
originally posted on bikeinn.com
I got this bottom bracket when I upgraded my crankset to Shimano Claris. The original square tapered bottom bracket wasn't as stiff as this is. I would buy again if needed, but even after putting 2000k on it, it has not even creaked once. Thank you.
originally posted on pushys.com.au
Very happy with quick supply of this item. Also the price is extremely cheap. As i fixed a bike for a friend who is doing it tough. Quality isn't and issue as it is Shimano
originally posted on ebay.com
This BB is what one needs to gear up their MTB with road bike crank to fit in standard 73mm English 30 threaded shell. This BB pushes the drive side crank just enough out to clear the frame to be able to fit road crank Octalibk v2 style on a mountain bike frame. Now I have 53/39T with 11-32 cassette mtb (2x10soeed) that I use as a commuter and can still granny up steep hills and then get up to 48 mph on the other side. Chain line is fine, few mm (about 3) that were necessary to push the drive side out and clear the frame translate in to within tolerance angle at the rear end for smooth shifting and no rubbing.
| Variant | |
| size | 68x121 |
Shimano BB-ES300 Octalink bottom bracket Width 121 mm
Delivery $40.82
BB-ES300 BOTTOM BRACKET/ HOLLOW-TYPE -68 x 121mm
Delivery between 15–17 Sept $9.95
BB-ES300 BOTTOM BRACKET/ HOLLOW-TYPE -68 x 121mm
Delivery between 15–23 Sept $9.95
Shimano Bb-es300 Octalink Bottom Bracket - 68 X 121mm
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Shimano BB-ES300 68x121mm Hollow-Type Bottom Bracket
Delivery between Fri – Wed $9.90
I got this bottom bracket when I upgraded my crankset to Shimano Claris. The original square tapered bottom bracket wasn't as stiff as this is. I would buy again if needed, but even after putting 2000k on it, it has not even creaked once. Thank you.
Very happy with quick supply of this item. Also the price is extremely cheap. As i fixed a bike for a friend who is doing it tough. Quality isn't and issue as it is Shimano
This BB is what one needs to gear up their MTB with road bike crank to fit in standard 73mm English 30 threaded shell. This BB pushes the drive side crank just enough out to clear the frame to be able to fit road crank Octalibk v2 style on a mountain bike frame. Now I have 53/39T with 11-32 cassette mtb (2x10soeed) that I use as a commuter and can still granny up steep hills and then get up to 48 mph on the other side. Chain line is fine, few mm (about 3) that were necessary to push the drive side out and clear the frame translate in to within tolerance angle at the rear end for smooth shifting and no rubbing.
This is a hard one to review because although the product is good and fairly cheap, it just isn't as robust as I would like. That said I'm a hard rider so wear things out quickly. My wife manages twice to three times the life on the same part.Anyway it's a quick and easy fix if you have the tools and it's maintenance free once fitted so overall I give 4 out of 5 stars because I'd like them to last slightly longer for me.
Typical good quality Shimano product. Fitted perfectly straight out of the box. No fitting instructions but its pretty straightforward as long as you have the correct tool. Just remember that on one side there is a left handed thread.
Not many choices available for the old octalink drivetrain. Expect shimano’s usual levels of quality, but yet to see how much abuse this can take. Shipping was fast, price was good. No complaints!
Purchased as a direct replacement for Shimano ES-51 of similar size. Perfect fit.t
so this is the replacement bottom bracket for es70, since it's no longer made. the previous model was a little heavier than the current but feels to be better made. es300 has a plastic cover on the crank side that can, over time get exposed to salt, cold, heat which will eventually wear down the plastic and allow things to get in. personally, they should've just kept the same design and not worry about any future wear and tear.
I bught this part for a vintage Italian bike restoration but I didn't know that the bottom bracket would not fit my crankarms. Would like to return.
Good part,very quick to sort any problems out. Reliable trader.
| Variant | |
| size | 68x121 |
