KT / Wheelmaster HD Alloy Coaster Brake Service BulletinUpdated 4 months ago
SUBJECT |
The KT / Wheelmaster Heavy Duty Alloy Coaster Brake Hub, sold to dealers between February 25 and August 16, 2022, either as a hub or a complete bike, was manufactured with a clutch spring that does not engage the clutch spring holder with sufficient resistance, causing it to slip during braking. This issue can lead to reduced braking efficiency, pedal engagement problems, and unusual noises from the hub. To resolve this problem, the Clutch Spring Assembly must be replaced.
PRODUCTS AFFECTED |
| KT / Wheelmaster Heavy Duty Alloy Coaster Brake Hub | |||
| Model | Part Number | Spec | Color |
| KT / Wheelmaster HD Alloy Coaster Brake Hub | 371726 | 36H / 14G | Silver |
| KT / Wheelmaster HD Alloy Coaster Brake Hub | 371727 | 36H / 12G | Silver |
| KT / Wheelmaster HD Alloy Coaster Brake Hub | 371728 | 36H / 14G | Black |
| KT / Wheelmaster HD Alloy Coaster Brake Hub | 371729 | 36H / 12G | Black |
| Sun Bicycles Lil Bolt (Shipped between 06/21/22 Thru 09/16/22) | |||
| Model | Part Number | Frame Size | Color |
| Lil Bolt | 69330 | 12" | Gloss Black |
| Sun Bicycles Boardwalk CB (24" Wheels) (Shipped between 3/24/22 Thru 09/16/22) | |||
| Model | Part Number | Frame Size | Color |
| Boardwalk | 670190 | 14" | Gloss Black |
| Boardwalk | 670191 | 14" | Metallic Blue |
| Boardwalk | 670192 | 14" | Sunglow Yellow |
| Sun Bicycles Boardwalk CB (26" Wheels) (Shipped between 02/25/22 Thru 09/16/22) | |||
| Model | Part Number | Frame Size | Color |
| Boardwalk | 670183 | 17" | Gloss Black |
| Boardwalk | 670184 | 17" | Metallic Blue |
| Boardwalk | 670185 | 17" | Sunglow Yellow |
| Boardwalk | 670529 | 19" | Gloss Black |
| Boardwalk | 670530 | 19" | Metallic Blue |
| Boardwalk | 670531 | 19" | Sunglow Yellow |
| Boardwalk | 670186 | 20" | Gloss Black |
| Boardwalk | 670187 | 20" | Metallic Blue |
| Boardwalk | 670188 | 20" | Sunglow Yellow |
| Boardwalk | 670189 | 23" | Gloss Black |
PROBLEM |
The end of the Clutch Spring, where it connects to the Clutch Spring Holder, may become stretched or deformed during the initial factory assembly, resulting in a less-than-secure fit.
SYMPTOMS |
When the brake is applied, the Clutch Spring can rotate slightly on the Clutch Spring Holder before fully engaging the brake. This can result in reduced braking efficiency, pedal engagement issues, or unusual noises from the hub.
• Clutch Spring Holder (Part No. 7 on the Exploded View)
• Clutch Spring (Part No. 8 on the Exploded View)
Note: It is also possible for the clutch spring on a coaster brake hub to wear out over time and produce the same symptoms as listed above.
SOLUTION |
• Swap out the Clutch Spring Assembly with a new one.
• JB Part No. 880981 https://www.jbi.bike/site/product_details.php?part_number=880981
• The Clutch Spring Assembly comes pre-assembled and pre-greased, making the installation process quicker and easier.
ESTIMATED REPAIR TIME |
• Complete Bike: It will take approximately 10-15 minutes to remove the rear wheel from the bike, replace the Clutch Assembly, and then re-install the wheel
• Hub Only: It will take approximately 5-10 minutes to replace the Clutch Assembly.
LABOR CREDIT |
• The Clutch Assembly can be shipped to the shop at no charge.
• A $20 labor credit is offered for each hub repair.
DISPOSITION OF PARTS |
• The original Clutch Spring Assembly should be returned to the rep, along with the part number and serial number of each bike repaired.
• All credits due will be processed by your sales rep or local facility manager.
CONTACT |
For questions related to this matter, please contact JBI Customer Support in Miami, FL. Any one of the following team members can assist you:
| • Local (305) 238-1866 | Gary M. Ext. 298 |
| • Toll Free: (800) 666-0400 | Chris A. Ext. 240 |
| • Email: [email protected] | Lisandro E. Ext. 236 |
| • Web: www.jbi.bike | Mike W. Ext. 507 |