RCFeed Logo
Builds FeedParts FeedRC MarketplaceDiscussAbout Us
Parts/Suspension & steering/Shock parts & springs/Revolution Design Ultra P4-Size 1/8 Shock O-Ring (16)
Revolution Design Ultra P4-Size 1/8 Shock O-Ring (16)
Revolution Design

Revolution Design Ultra P4-Size 1/8 Shock O-Ring (16)

Part # RDRP20023.5(4)
Shock parts & springsLandcraft
Fits
Mugen MBX8Tekno RC EB48Tekno RC NB48Mugen MBX8TKyosho Inferno MP10Tekno RC NT48HB Racing D8Tekno RC ET48Kyosho Inferno MP9Mugen MBX7HB Racing D8TMugen MGT7Mugen MBX6Mugen MBX7TKyosho Inferno GT/GT2Kyosho Inferno STTeam Durango DEX408HPI Vorza Flux HPTeam Durango DNX408Team Durango DNX408TTeam Durango DEX408T
Where to buy
$5.99
AMain Hobbies
Seen Oct 12, 2026
$5.99Buy
Prices are as last seen at the store; stock is not tracked.

About this part

This is a pack of sixteen Revolution Design Racing Products Ultra P4-Size 1/8 Shock O-Rings. These shock seals are made from a specially formulated compound that is less prone to "swelling" when exposed to silicone shock oil meaning a better seat of the seals within the damper cartridge over a longer period of time. The O-rings also have a lower break away point compared to standard "orange" seals for more sensitive damper action. The package includes sixteen o-rings, enough to equip 8 shocks, and they fit nearly all of today's 1/8th off-road shocks.

Reviews3.5 · 4 reviews

DVerified owneron Revolution Design Ultra P4-Size 1/8 Shock O-Ring (16)

I was in need of orings for my mugen mbx8 and stock were on back order. Installed these and was worried at first since the friction was so light and didn't think they would seal. So far so good after several rebuilds with good oring grease.

1 found this helpful
Greg Smithon Revolution Design Ultra P4-Size 1/8 Shock O-Ring (16)

Well I don't know about that I used in my TKI2 and it fits perfectly. As well as I've been using them in my MP9's for a while now and they're great product! ???

1 found this helpful
Mark Brownon Revolution Design Ultra P4-Size 1/8 Shock O-Ring (16)

This might be a great product, however the list of compatible vehicles includes some with 3.5mm shock shafts (Mugen, Kyosho) and some with 4mm shafts (Tekno). The same O-ring can't possibly work in both. What does "P4-Size" mean?

Vince OghobaaseVerified ownerMay 6, 2021on Revolution Design Ultra P4-Size 1/8 Shock O-Ring (16)

These do not fit Kyosho MP10 shocks, not thick to get correct seal. Must use kyosho brand orings in the shocks.

What reviewers say

Four reviews of the Revolution Design Ultra P4-Size 1/8 Shock O-Ring (16), rated 1 to 5 stars. Two reviewers report good results: one verified owner says the O-rings sealed well after several rebuilds in a Mugen MBX8 with oring grease, and another says they fit a TKI2 and MP9 shock. Reviewers disagree on fit and seal. One review of a Kyosho MP10 shock reports that the O-rings did not fit and were not thick enough to seal, recommending Kyosho brand O-rings instead. Another reviewer notes that the listed compatible vehicles include both 3.5mm (Mugen, Kyosho) and 4mm (Tekno) shock shafts, questioning how one O-ring could suit both and asking what P4-Size means. The sample is small and the reviews conflict, so suitability likely depends on the specific shock.

  • + Fits and seals in some shocks
  • + Works after several rebuilds
  • + Fits TKI2 and MP9 shocks
  • − Does not fit Kyosho MP10 shocks
  • − Seal may be insufficient
  • − Compatibility list mixes shaft sizes
  • − Sizing unclear
Summary generated from the reviews above.

Builds using this part

No builds use this part yet — add it to yours from the build editor.