Kyosho UM565 S-10 O-Ring 9.5x1.5mm 10pcs

A pack of ten S-10 size O-rings measuring 9.5mm outside diameter by 1.5mm cross-section, used across Kyosho's Ultima RT5 and RT6 trucks and the V-One R4 nitro touring car range.

O-rings this size are sealing elements in shock caps, fuel and exhaust joints, and differential housings depending on the platform, and they are pure consumables. Heat cycles, fuel, shock oil and simple compression set all harden them until they stop sealing. A tired O-ring is the usual cause of a shock that mysteriously loses oil over a weekend, or a gear diff that starts weeping.

Replacing them is quick and cheap, and doing it as a set during a rebuild is far less frustrating than diagnosing one failed seal at a time.

These are genuine Kyosho parts made to the original specification, so they seat properly in the factory grooves without being over- or under-compressed. Ten are supplied, enough for a full service with spares. Kyosho lists this part for the Ultima RT5, Ultima RT6, and the V-One R4, R4 SP, R4s, R4s II and R4 Evo.2.