Shimano BB-UN300 Bottom Bracket (Length: 68 x 117.5mm)
Shimano UN300 cartridge bearing Square Taper (JIS) bottom bracket with alloy cups. Successor to the UN26 and UN55 series, this component covers a wide range of applications from Touring and City bikes to older Road and Mountain bikes. Suitable for traditional square mount chainsets, featuring a 68mm shell with BSA (English) 1.370" x 24tpi thread. Crank bolts are not included.
Shimano UN300 cartridge bearing Square Taper (JIS) bottom bracket with alloy cups. Successor to the UN26 and UN55 series, this component covers a wide range of applications from Touring and City bikes to older Road and Mountain bikes. Suitable for traditional square mount chainsets, featuring a 68mm shell with BSA (English) 1.370" x 24tpi thread. Crank bolts are not included.
Shimano UN300 cartridge bearing Square Taper (JIS) bottom bracket with alloy cups. Successor to the UN26 and UN55 series, this component covers a wide range of applications from Touring and City bikes to older Road and Mountain bikes. Suitable for traditional square mount chainsets, featuring a 68mm shell with BSA (English) 1.370" x 24tpi thread. Crank bolts are not included.
Shimano UN300 cartridge bearing Square Taper (JIS) bottom bracket with alloy cups. Successor to the UN26 and UN55 series, this component covers a wide range of applications from Touring and City bikes to older Road and Mountain bikes. Suitable for traditional square mount chainsets, featuring a 68mm shell with BSA (English) 1.370" x 24tpi thread. Crank bolts are not included.
in 26 offers
The lowest price for Shimano BB-UN300 Bottom Bracket (Length: 68 x 117.5mm) right now is $20.99 at George's Bike Shop, compared across 21 retailers.
The all-time low was $17.01 on 13 Feb 2026 — today's price is 23% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 11 May 2026.
Last updated at 11/05/2026 01:01:06
Shimano BB-UN300 Bottom Bracket 68 x 117.5mm
Delivery between 11–21 May $12.95
Shimano BSA 117.5/68mm BB-UN300 Square Bottom Bracket
Delivery $65.99
Shimano BB-UN300 Bottom Bracket - 68mm-117.5mm
Delivery between 14–18 May $9.95
Shimano BB-UN300 Bottom Bracket - 68mm-117.5mm
Delivery between 14–22 May $9.95
Shimano UN300 Bottom Bracket w/out Fixing Bolts 68x117.5mm
Delivery between Tue – Fri $9.90
Shimano BB-UN300 Bottom Bracket 68x117.5mm W/O Fixing Bolts
14-day returns
Shimano BB-UN300 Bottom Bracket 68x117.5mm W/O Fixing Bolts
Delivery between 11–18 May $9.99
Shimano UN300 Bottom Bracket w/out Fixing Bolts 68x117.5mm
Delivery between Tue – Fri $9.90
Mov.Pedal.Ro Bsa 68-117.5MM
Delivery $10.00
Shimano BB-UN300 bottom bracket British thread 68 - 117.5 mm
Delivery $11.26
| Earn | 3x points |
| and collect | 87 Everyday Rewards points |
| Shimano Series | Nexis Inter-3 |
| Thread | English Thread |
| Frame Width | 68mm |
Shimano BB-UN300 Bottom Bracket 68 x 117.5mm
Delivery between 11–21 May $12.95
Shimano BSA 117.5/68mm BB-UN300 Square Bottom Bracket
Delivery $65.99
Shimano BB-UN300 Bottom Bracket - 68mm-117.5mm
Delivery between 14–18 May $9.95
Shimano BB-UN300 Bottom Bracket - 68mm-117.5mm
Delivery between 14–22 May $9.95
Shimano UN300 Bottom Bracket w/out Fixing Bolts 68x117.5mm
Delivery between Tue – Fri $9.90
| Earn | 3x points |
| and collect | 87 Everyday Rewards points |
| Shimano Series | Nexis Inter-3 |
| Thread | English Thread |
| Frame Width | 68mm |
