

0251L101U400220
**SEE BELOW FOR SPRING RATE CHART. Springs Sold Separately.**
During the development of the WP AER 48, WP benchmarked the AER system with conventional systems, which use spiral springs. Both systems showed different advantages, which were each favored by different riders. In order to provide both options, WP has decided to also provide a retrofitting kit, which simply allows rebuilding the AER 48 technology into a conventional system. With this kit, the AER 48 air cartridge on the air fork leg is replaced with a spring cartridge kit. All functionalities remain at the same level, with the feeling and functionality of the conventional system. The damping side remains unchanged. Single leg spring conversion kit for 2021-2022 TX/FX Models.
We have included spring rates to choose from with this product. To capture the true technology of this spring conversion system, a proper spring rate for your weight needs to be provided. See the chart below to determine the spring rate you need according to your bike. Have any questions? Please CONTACT US HERE and we can get you sorted out!
| Year | Bike Model | Rider Weight With Gear (lbs) | Spring Rate |
| 2021+ | TC 125 |
121-143 | 8.4 N/MM |
| 143-165 | 8.8 N/MM | ||
| 165-187 | 9.2 N/MM | ||
| 187-209 | 9.6 N/MM | ||
| 209-232 | 10.0 N/MM |
| Year | Bike Model | Rider Weight With Gear (lbs) | Spring Rate |
| 2021+ | TC/FC 250 |
121-143 | 9.2 N/MM |
| 143-165 | 9.6 N/MM | ||
| 165-187 | 10.0 N/MM | ||
| 187-209 | 10.4 N/MM | ||
| 209-232 | 10.8 N/MM |
| Year | Bike Model | Rider Weight With Gear (lbs) | Spring Rate |
| 2021+ | FC 350 |
121-143 | 9.6 N/MM |
| 143-165 | 10.0 N/MM | ||
| 165-187 | 10.4 N/MM | ||
| 187-209 | 10.8 N/MM | ||
| 209-232 | 11.2 N/MM |
| Year | Bike Model | Rider Weight With Gear (lbs) | Spring Rate |
| 2021+ | FC 450 |
121-143 | 10.4 N/MM |
| 143-165 | 10.8 N/MM | ||
| 165-187 | 11.2 N/MM | ||
| 187-209 | 11.6 N/MM | ||
| 209-232 |
Shipping of motorcycle units is only allowed for specific cases. Please contact our sales team to check eligibility and payment process.
New and unused items within the first 10 days of delivery can be exchanged or refunded. Items must be returned with all manufacturer’s packaging and placed inside an external shipping box.
Important: Anything sent back to us without an external shipping box is breaking our refund/exchange policy and will be sent back to sender without a refund.
Any merchandise which has been “taken out for a ride” is considered used and cannot be returned. We encourage you to walk on your carpet if trying boots, or to wear your helmet indoors before heading out on the bike.
Any part which has been installed or shows signs of attempting to be installed on a vehicle is non-returnable.
The cost for return shipping is a flat $25 + tax and will be deducted when we issue your refund.
If you’d like to make an exchange, you will need to place a second order for the new item.
Certain conditions and exceptions can be applied to our return policy. If you're unsure if your product qualifies, give us a call. There are certain items that we cannot accept as returns. These include:
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