What fork seal fits a Beta RR 4T 390 Race?

The Beta RR 4T 390 Race uses a 48 mm fork. We stock the manufacturer-verified seal and bushing kits for it; matching is done off the verified application list, not just the seal size.

What size is the Beta RR 4T 390 Race fork?

The Beta RR 4T 390 Race has a 48 mm fork.

Can I use any seal with the same dimensions?

No. Fork seals can share a size and still not seat correctly in a different fork design, so use the seal verified for your bike. The kits listed here are confirmed by the manufacturer to fit the Beta RR 4T 390 Race.

Beta RR 4T 390 Race Fork Seals

Q: What fork oil does the Beta RR 4T 390 Race use?

The Beta RR 4T 390 Race uses 5wt fork oil, about 540 ml per leg (factory fill Motul 5wt (KYB AOS spec)).

The Beta RR 4T 390 Race runs a 48 mm front fork.Every kit here is verified by the manufacturer to fit this exact bike. Fork seals can share a size and still not seat in a different fork, so we only list what is confirmed for your bike.