Technical sheet

SunRace BSA bottom bracket

Q: I now have a Shimano BB-UN50 in my retro racing bike, but the axle length on the right is about 1 cm too long, which makes the position of the front derailleur inconvenient. Total length is approx. 114.5 mm. In my opinion, this axle with a width of 103mm should be a good solution. Is that correct?

Hello,I suggest that you do some research on the specifications on the crankset in question. Retro is also a broad term. How is the retro road bike designed? If you mean that it is a steel frame with a 1-1/8 seat tube for a clamp-on or braze-on front derailleur and a 68mm English threaded bottom bracket, and a 126mm OLD rear end, the crank in question requires a specific bottom bracket as would a frame with different specs. Once this is determined, the proper bottom bracket can be selected. SunRace makes bottom brackets of various specifications, so there should beone available for you. In addition, do not install a Campagnolo or similar classic Italian crank on this bottom bracket. This is an JIS axle taper tor Japanese / Taiwanese (Shimano, SunTour, Sugino, etc.) cranks.Classic and modern Italian cranks require ISO paper axles. I hope this helps.Best,AldoSan Francisco / Oakland, California, USA

Q: Good afternoon, does it include the metal shaft?

Hello,All steel construction. NOT for use with CAMPAGNOLO or other vintage Italian cranksets e.g. Gipiemme, Ofmega, Miche, or any crank arm requiring an ISO tapered axle.This is for a JIS tapered required crank arm--SunRace, Shimano, SunTour--all the Japanese, Taiwanese, and Chinese cranksets or custom American, British, etc. Check the specs for the crankset you intend to use.All The Best.ALDO--OAKLAND, CALIFORNIA, USA

Q: Hello. I have a 90-90 GAC road bike, I´m going to change the ball key bottom bracket for this one. My keyed bottom bracket is 134mm and has a 34mm thread and 67mm axle length. I understand that this could work for me by taking the longest bottom bracket, right? And some cranks with a single chainring of about 46-48 teeth for 5 sprockets? Any advice? Thank you

HelloThere are too many variables here. The prime objective is proper chainline. Some Cranks is too arbitrary. Is it a 5 speed rear end ( 121mm OLD ).I suggest selecting the crankset, and then do some research on how to determine chainline and axle length. Remember, this is an English threaded bottom beacket-1.370 x 24tpiGood Luck,Aldo--Oakland, California USA

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Features of SunRace BSA

Product description of SunRace BSA bottom bracket

Description summary

Restore smooth, reliable cycling with the SunRace BBS15 BSA Bottom Bracket. This cost-effective solution tackles creaking and resistance, featuring precision-sealed cartridge bearings to combat dirt and water for a fluid pedal stroke and reduced maintenance. Its JIS square taper and common BSA threading ensure broad compatibility with many bike frames and easy installation. The durable silver steel axle delivers efficient power transfer, while lightweight plastic shells keep the weight down. Ideal for MTB and urban cycling, it´s a dependable upgrade or replacement for a better ride

SunRace BBS15 BSA Square Taper Bottom Bracket

Revitalize your bicycle´s drivetrain with the SunRace BBS15 BSA Bottom Bracket, an essential component for a smooth, reliable, and efficient ride. If you´re experiencing creaking, resistance, or play in your crankset, this high-quality bottom bracket is the perfect cost-effective solution to restore your bike´s performance. Designed for dependability and broad compatibility, it´s an ideal upgrade or replacement for a vast range of bicycles.

Key Benefits:

Experience a profoundly smoother pedal stroke. At the core of the BBS15 are precision-sealed cartridge bearings. This modern design effectively shields the internal mechanism from water, dirt, and road grime, drastically reducing friction and the need for frequent maintenance. The result is a quiet, fluid, and consistent pedaling motion that allows you to transfer power more efficiently, whether you´re accelerating from a stoplight or climbing a hill. Its robust construction ensures long-lasting durability, giving you the confidence to ride further without worrying about component failure.

Main Features:

The SunRace BBS15 is engineered around the proven and widely-used JIS square taper (4-edge) interface, ensuring a secure and solid connection with compatible crank arms. It features the most common BSA threading, making it suitable for a majority of modern and classic bike frames. Installation and removal are straightforward for any home or professional mechanic, as it is designed to be serviced with a standard Shimano bottom bracket tool. The strong, silver steel axle provides the stiffness needed for effective power transfer, while the lightweight plastic shells help keep the overall weight down without compromising on a secure fit within the frame.

This bottom bracket is a versatile workhorse, perfectly suited for various cycling disciplines. For MTB Cycling, its sealed design and durable build provide the reliability needed to handle light trails and unpredictable conditions. For Urban Cycling, it offers a ´fit-and-forget´ solution that stands up to the daily grind of commuting, ensuring your bike is always ready to go.

Brand:- SunRace.

Specifications:
-SUNRACE bottom bracket ´´BBS 15´´self-service package, 4-edge, BSA JIS for Shimano tool, with plastic shells, silver axle.
-BOT.BRACKET SUNRACE BBS.
-15 BSA JIS,PLASTIC SHELLS.
-TW

Specifications

Manual

Technical specifications of SunRace BSA

Features of SunRace BSA

Color Silver

Color

Silver

Recommended Use MTB Cycling

Recommended Use

MTB Cycling

Urban Cycling

Key differentiators

Technology in SunRace BSA bottom bracket

Energy rating

Warnings

4.9 / 5

40 Reviews

What our customers are saying about SunRace BSA bottom bracket

This bike bottom bracket offers excellent value and fits various traditional bikes and VTC frames. Buyers praise its good quality and performance, with one noting it withstands abuse better than other models. The alloy cups and width options allow for precise crankset alignment, ensuring a straighter chain pull. It´s described as a reliable and affordable equivalent to Shimano bottom brackets, perfect for bike restoration and entry-level bikes. While some mention screws aren´t included, the product generally meets expectations and fits frames perfectly

Quality, price, shipping

2026/08/14

Manu

I bought new crank arms and when I mounted them, the chainline was very misaligned. The solution was a new bottom bracket at 113 mm. I bought the Sunrace and with shipping for €10, good quality, good square taper bottom bracket, installed and adjusted, very smooth, recommended, good quality and good price

Quality, good replacement for the old one

2026/08/05

Alberto

Remove the old one due to wear, clean the area well, lubricate and install the new one, a good job well done

Material with the necessary quality

2026/08/04

marco

Component with the necessary quality for its function. Good product. Quality bearings and a metal structure that will give it strength

Good bottom bracket housing

2026/06/04

Louis

Perfect if you need a very long bottom bracket (up to 131mm). Be careful, it is delivered without the screws on the side!!

Sunrace bottom bracket

2026/04/18

marco-

I liked it. Good value for money. Everything as described

Old-fashioned square

2025/11/30

Luc

Excellent value for money for this unpretentious case which does the job on our traditional bikes.

Box

2025/09/21

José

It is the correct measurement but in the photo it has the screws but in reality it does not come with screws

Sunrace square axle housing

2025/09/03

Philippe

Top competitive price meets my needs Fast shipping

Compliant product

2025/08/15

vincent

Product as described, fits perfectly with the VTC frame I ordered it for. The case seems to be of good quality.

Bottom bracket 68/103mm

2025/06/13

MOUSs

Product meets my expectations, I highly recommend. Well packaged, deadlines met perfectly.

Praise

2025/06/06

aAlex de Oliveira

Perfect fit, robust

The bottom bracket axle

2025/06/03

Vladimir

Easy to replace. Works well.

does what it says on the label

2025/04/27

peter

decent quality BB

Mejor que Shimano

2025/03/15

Nico

el nuevo bb-300 tiene una tendencia a fallar rápido. este en cambio, aunque bastante más pesado, aguanta mucho abuso. excelente para ciudad o turismo.

2025/02/09

Samuel

Perfect.. section!

Sunrace bottom bracket

2025/01/15

Jean

Good product, careful shipping, competitive price

Sunrace bottom bracket

2025/01/15

Jean

Careful shipping in accordance with my order! Good price I recommend

Quality bottom bracket

2024/12/21

Joël

Equivalent to a Shimano bottom bracket and more affordable

As described, good price and product

2024/10/02

Capi

As described, good price and product

Width on demand

2024/06/27

Marcel

Product already purchased previously and used successfully. I appreciate the alloy cups and the variety of widths offered to better align the crankset in relation to the cassette. This way the chain pulls as straight as possible.

Thanks!

2024/06/14

martin

Great value for the money! Will buy again

Just like promised

2024/06/13

Martin

Ordered these for two bikes i had. Worked like advertised

Prima product

2024/06/01

Bart

Great bottom bracket, note that the bolts are not included!

Excellent for the price

2024/05/11

DAVIDE

Not very smooth, but perfect for entry level bikes at a price that can't be beat.

Good

2024/05/08

Dragan

Good bottom backet at great price.

With s

2024/03/11

André

This is the right product with good value for money.

Correct

2024/02/12

Edu

Exactly what I expected, I changed the destroyed axle from a classic with cups and it works correctly. Shipping within the deadline.

Good article

2024/02/04

José Manuel

Quality at a good price. It fit the frame perfectly. Perfect.

Quality

2023/10/25

Trevor F.

Very good value for money as the Sunrace products are relatively reliable products.

Feet perfectly old 30 years bike

2023/08/13

Vasco

Feet perfectly my old 30 years bike, I replaced a very old bottom bracket. The quality is very good

Good product

2023/06/17

Manuel Ramírez Ruiz

Good quality, good product

Correct

2023/05/31

Igor

It looks robust. But the connecting rod stop screws do not come

Bottom bracket

2023/01/21

Nuria

Excellent product. fully compatible. And serious provider. It arrived in the estimated time and with the possibility of following the product at all times. I have already bought more times and very well

quality product

2023/01/20

Ryan

Does what it’s suppose to do and great price

Fully compatible part

2023/01/18

Alberto

It must be the same part, if so, the function is correct, and so, it has been.

Correct

2022/10/20

Carlos

Looks strong but use will tell

Sunrace

2022/10/12

Luca

Sunrace bottom bracket always a guarantee!

Bottom bracket

2021/12/27

Tosco

Perfect for restoring my road bike from 40 years ago. Description according to the product. Very fast shipping, in 2 days I had it at home.

Central movement

2021/12/10

marco

very good sunrace bottom brackets

Good value for money

2021/08/15

Hugo

All correct, quality according to the price.

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Include AI Generated questions and answers

2022-06-28

Alessandro

Hi, I have to replace the bottom bracket of my MB size xxl. D NL BC 68 / 68K BC 1,37X24 Which one is compatible ??

Answer of alejandro

hello, the bottom brackets of this style, there are several measures to look at. the width of the thread can be 68, 70 or 73. then there are some that have more threading than others depending on the bike model. and the most important thing is the width. which can be 109mm 111 113 117, you have to put the same width, otherwise you will be moving the chain. measure yours, and so you will know. Width is usually 68mm on most bikes