This modification applies to WH-7850-C24-CL and WH-7850-C50-CL wheels only. No other wheels are affected by this change.
We have found that there is a greater likelihood of a puncture in DURA-ACE clincher tyre wheels WH-7850-C24-CL and WH-7850-C50-CL. This is due to the surface texture of the rim in combination with the use of spoke-hole plugs.
The phenomenon can be very easily eliminated by replacing the spoke-hole plugs with genuine 18 mm high pressure Shimano rim tape.
What to do?
If you have sold any wheels, or bicycles equipped with these wheels, that are affected – where possible – please notify the customer or user about this modification.
If you still have stock of the affected wheels in your shop, please replace the plugs with rim tape.
We will be happy to provide the rim tape free of charge. To obtain the rim tape - or if you require more information - please contact your local Shimano distributor.
