# AEYINO 104 BCD Single-Speed MTB Crankset, 170 mm Square Taper

AEYINO’s 104 BCD single-speed MTB crankset pairs 170 mm crank arms with a narrow-wide chainring. The listing describes a square-taper fitting and says the set is only for single-speed use, so confirm your bottom-bracket interface and drivetrain before choosing it.

- [Original product page](https://bargainpostbox.co.uk/product/aeyino-104-bcd-single-speed-mtb-crankset-170mm)
- [View offer](https://bargainpostbox.co.uk/visit/aeyino-104-bcd-single-speed-mtb-crankset-170mm)
- Market: UK
- Language: en-GB
- Currency: GBP
- Brand: AEYINO
- Category: Sports & Outdoors > Cycling > Bicycle Parts & Accessories
- Price: 21.24 GBP
- Previous price: 24.99 GBP
- Discount: 15%
- Price checked: 2026-11-13T06:03:42.073Z
- Rating: 5 / 5
- Reviews: 5

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- The 170 mm arms use a square-taper interface and 104 BCD chainring mounting pattern.
- The listing describes a narrow-wide chainring intended to help prevent chain drop.
- A square-taper bottom bracket is required, and the listing limits use to single-speed bicycles.

## Pros

- The narrow-wide tooth profile is a concrete chain-retention feature for a single-speed setup.
- The stated 170 mm arm length and 104 BCD pattern make key fit details easy to compare with an existing crankset.

## Cons

- The stated single-speed-only compatibility excludes multi-speed drivetrains.

## Specifications

### Identity
- Brand: AEYINO
### Fit and construction
- Crank arm length: 170mm
- Crank interface: Square taper
- Chainring mounting pattern: 104BCD
- Crank material: aluminum alloy
- Chainring material: 7075 aluminum alloy
- Drivetrain compatibility: The crank and chainring are only fit single speed, cannot be used with other multi speed
### Chainring and finish
- Available chainring sizes: 30/32/34/36/38/40T
- Selected size: 38T Round
- Colour listing: Crank+38T-Black Chainring
### Package dimensions
- Dimensions and weight: 25.6 x 17.6 x 6.8 cm; 700 g

## Before you buy

- The listing identifies the selected chainring as 38T Round while also describing a choice of 30/32/34/36/38/40T. It says a square-taper bottom bracket is needed and says the package does not include a bottom bracket or caps. Check the selected listing and your existing bottom-bracket fit before purchase. Chainring placement can shift the chainring by about 10 mm, and the listing advises against washers between the crank and ring because the supplied bolts are not long enough.

## A good fit for

- Riders replacing a crankset on a single-speed bicycle with a compatible square-taper bottom bracket and 104 BCD fit.
- Buyers seeking 170 mm crank arms and a narrow-wide chainring in the listed tooth-count range.

## Less suited to

- Bikes with multi-speed drivetrains, according to the listing.
- Buyers who need a crankset supplied with a bottom bracket or crank caps.

## Customer feedback

The supplied feedback consists only of a small aggregate rating sample, with all recorded ratings in the five-star category. That is a positive but limited signal and does not establish what buyers liked or how the crankset performs. Check the stated single-speed restriction, square-taper fit and chainring variant against your bike before relying on the rating.

## Frequently asked questions

### Does this crankset include a bottom bracket?
The listing says a square-taper bottom bracket is required but not included. It also says bottom-bracket bolts and caps are not included.
### Can I use it with a multi-speed drivetrain?
The listing explicitly says the crank and chainring are for single-speed use and cannot be used with other multi-speed setups.
### What chainring size is supplied?
The selected size is listed as 38T Round, while the feature text lists options from 30T to 40T. Confirm the selected variant before ordering.

## Alternative options

- [AEYINO 104 BCD Hollow Integrated MTB Crankset - 170mm 1x \| Hollow integrated design, 30T-38T narrow wide chainring, includes bottom bracket & bolts, lightweight aluminum alloy](https://bargainpostbox.co.uk/visit/aeyino-104-bcd-single-speed-mtb-crankset-170mm)
- [Mountain Bike Crankset, MTB Square Taper Crankset with 170mm Arm 104 BCD, Compatible with Single Speed Bicycle and 8/9/10/11 Speeds Bicycles, Optional 32T/34T/36T/38T/40T/42T Chainring Crank Set](https://bargainpostbox.co.uk/visit/aeyino-104-bcd-single-speed-mtb-crankset-170mm)
- [kefeimumu Bike Crankset Aluminium Alloy Square Taper Crank Set for 8/9/10/11 Speeds, Mountain Bike Crankset 170MM Arm 104 BCD 32/34/36/38/40/42T Round Chainring](https://bargainpostbox.co.uk/visit/aeyino-104-bcd-single-speed-mtb-crankset-170mm)
- [SURIEEN Black Square Crankset, 170mm Arms and 104 BCD MTB Taper Crankset \| Mountain Bike Crankset for Single Speed Bicycle, Optional 32T/36T/38T/40T/42T Chainring Crankset](https://bargainpostbox.co.uk/visit/aeyino-104-bcd-single-speed-mtb-crankset-170mm)
- [AEYINO 64/104 BCD Triple MTB Crankset - 170mm Square Taper \| 3x22/32/44T chainrings included, 64/104 BCD double/triple pattern, compatible with 9 speed drivetrains](https://bargainpostbox.co.uk/visit/aeyino-104-bcd-single-speed-mtb-crankset-170mm)
- [MEGHNA Bicycle Crankset Set 170 mm Crankset 42T Universal for Single Speed and 6/7/8/9/10/11 Speed Bike, MTB, BMX Road Bike](https://bargainpostbox.co.uk/visit/aeyino-104-bcd-single-speed-mtb-crankset-170mm)
- [AEYINO 104 BCD Hollow Integrated MTB Crankset - 170mm 1x \| Hollow integrated design, 30T-38T narrow wide chainring, includes bottom bracket & bolts, lightweight aluminum alloy](https://bargainpostbox.co.uk/visit/aeyino-104-bcd-single-speed-mtb-crankset-170mm)
- [Mountain Bike Crankset, MTB Square Taper Crankset with 170mm Arm 104 BCD, Compatible with Single Speed Bicycle and 8/9/10/11 Speeds Bicycles, Optional 32T/34T/36T/38T/40T/42T Chainring Crank Set](https://bargainpostbox.co.uk/visit/aeyino-104-bcd-single-speed-mtb-crankset-170mm)
- [Jiaroutk Mountain Bike Crankset, Square Taper Crankset with 170mm Arm 104 BCD, Compatible with Narrow Wide cassette and 8/9/10/11 Speeds Bicycles, 32T Chainring Crank Set](https://bargainpostbox.co.uk/visit/aeyino-104-bcd-single-speed-mtb-crankset-170mm)
- [kefeimumu Bike Crankset Aluminium Alloy Square Taper Crank Set for 8/9/10/11 Speeds, Mountain Bike Crankset 170MM Arm 104 BCD 32/34/36/38/40/42T Round Chainring](https://bargainpostbox.co.uk/visit/aeyino-104-bcd-single-speed-mtb-crankset-170mm)
- [SENQI Cycling Fixed Gear Chain Wheel Crankset Track Cycling Folding Bicycle CNC Bike Parts 170mm Crank 44T](https://bargainpostbox.co.uk/visit/aeyino-104-bcd-single-speed-mtb-crankset-170mm)
- [FOMTOR Bicycle Crank Arm Set 104 BCD Road Mountain Bike Crankset with Bottom Bracket and Chainring bolts 170mm Crank Arm](https://bargainpostbox.co.uk/visit/aeyino-104-bcd-single-speed-mtb-crankset-170mm)

## Add-ons

- [AEYINO BSA Square Taper Bike Bottom Bracket - 68mm \| Multiple spindle length options 110.5-174mm, smooth sealed bearings, fits 68mm BSA shell, compatible for MTB & road](https://bargainpostbox.co.uk/visit/aeyino-104-bcd-single-speed-mtb-crankset-170mm)
- [SHIMANO HG40 116 W/CL Chain - Grey, 6/7/8 Speed](https://bargainpostbox.co.uk/visit/aeyino-104-bcd-single-speed-mtb-crankset-170mm)

## Images

![AEYINO 104 BCD Single-Speed MTB Crankset, 170 mm Square Taper — 1](https://bargainpostbox.co.uk/i/Wpeko94mlkeGVFJ-Mth-UmsRAlzDfDualWRHkj-3WGeWISKLucJsmfWYfBQm0zPEe54cCITPJr4fA488ZzJkugqpgnxMqrGv13iDrXeLS3yI96G9rEqxgCba.jpg)

![AEYINO 104 BCD Single-Speed MTB Crankset, 170 mm Square Taper — 2](https://bargainpostbox.co.uk/i/E6x8kK6h3bbMtuAAT048tS7PHhPep6iB053nWrCrnqpHgrDLxV5ZHBpAVtmC_pa7Yio3r9GDyXohxGrW6xPM3jDfNuV6TSWg8LTUFU39vTr_G2H8B5_KBdhr.jpg)

![AEYINO 104 BCD Single-Speed MTB Crankset, 170 mm Square Taper — 3](https://bargainpostbox.co.uk/i/FhPlTBCTfXltAfylbA2a8-tCiq3OnF4NZ7ZHzu8FdssaQXp_RvuJ_LymWWfSPG0XPZLaT28JCbYw1FAo0aAfi6D95QSv5LRmYv9U_q3F1QfbLozISf3prw31.jpg)

![AEYINO 104 BCD Single-Speed MTB Crankset, 170 mm Square Taper — 4](https://bargainpostbox.co.uk/i/BNnsoMAexlA28GQuKOmUwYblTmKhGsQLQGQ02sfZrxU8Cch0a4VtAIZJn984TgtR8IUEcxjHyDzknW2LhcXWTiMTOgJMqYt6-0bvnSp4a2uzzxUoXFy9Oxia.jpg)

![AEYINO 104 BCD Single-Speed MTB Crankset, 170 mm Square Taper — 5](https://bargainpostbox.co.uk/i/drZHYYbcd40pA9Zz9H0OOA5SBlM6tC-49w0BV8ybarWfpbuo1btItCyA-78Tc_VR28TXbxAvIFVHZva5Avwb4uffYkqBhzgFlPvHI5qiz_ODrIM9Jvwgv_e8.jpg)

![AEYINO 104 BCD Single-Speed MTB Crankset, 170 mm Square Taper — 6](https://bargainpostbox.co.uk/i/AGtqvw5Ejaw-NACHYylBwP52-v_EfxGObKbAwWcEQwoKyDnPra61w8cc6gHmihngVD9w5_jO64UGGBjuU7eJMvS9qsZtuYqk3EmnV9Dh9TlfFixLGmThhzA4.jpg)

![AEYINO 104 BCD Single-Speed MTB Crankset, 170 mm Square Taper — 7](https://bargainpostbox.co.uk/i/wzHhJPD8GfgJFRTFZdTeQqLxRe7vjR7jE3AK5WbF_7G9zyUQgJQe2LkpUo7eAW5xBp-8kaNhrntoALL_AcbpwfSuJBqUkgi8YoT0miV9A3-8tkAyctgh7Y2d.jpg)