Maruha BC Street Coilover Suspension · NA/NB Miata 1990–2005
Maruha's street-optimized coilover — built by Buddy Club Japan and engineered around Maruha's core philosophy that street suspension starts with the spring. Softer, more compliant spring rates that keep the tyre planted on real roads rather than fighting them. Designed for the driver who wants proper coilover adjustability and Japanese build quality without going full track-spec.
Technical Specifications (from Maruha Motors Japan):

Spring rates: Front 6.0 kg/mm · Rear 4.0 kg/mm — optimized for street and spirited road use
15-step damping adjustment
NB-style OEM upper mount — compatible with NA and NB chassis
Full ride height adjustment via bottom bracket coilover method — dedicated spanner wrench included
Shaft specification identical to BC Damper — same plating and rust resistance standard
Overhaul (O/H) capable — absorber body available as standalone replacement
Slightly lower than stock ride height while retaining full suspension stroke

Fitment: Mazda Miata MX-5 NA (1990–1997) and NB (1998–2005) — all variants.
Made in Japan. Production lead time 2–3 months. Authorized Maruha import by Chikara Motorsports — North America's only official Maruha dealer.