Shocks (NA, NB, NC, ND)
Worn shocks make a Miata bounce and wallow, and owners disagree about what to replace them with. This page lists what sellers describe for each generation and what owners said. It is not a repair guide.
How to read it. Seller claims are as read on each seller's own page on 2 October 2026. Owner accounts are from Miata.net forum threads, dated below, and are individual opinions, not advice. There are no prices on this page, and nothing here was bought or tested.
| Seller | What it says it offers | Fits (as stated) |
|---|---|---|
| Moss Miata, Koni STR.T Street | a non-adjustable shock described as a good original-equipment replacement that adds stability and control without a harsh ride, and suits lowering springs or a bigger sway bar; sold individually with a lifetime warranty from Koni | 1990-2005 NA and NB |
| Moss Miata, Koni adjustable sport shocks ("Yellows") | adjustable damping, with an adjustable spring perch that can lower the car about half an inch on stock springs; sold as a pair | 1990-2005 NA and NB |
| Moss Miata, Koni adjustable sport shocks for the NC | adjustable damping with a knob for soft commuting or hard track days; unlike the earlier cars they have no adjustable spring perch, and it says to trim the front bump stops slightly if you use lowering springs; sold each | 2006-2015 NC |
| Flyin' Miata, NB shock conversion kit | upper mounts, bushings and washers so the NB-style shocks and springs bolt into an NA; bump stops are not included | fits 1990-1997 NA |
| Good-Win Racing, ND shocks | its ND shock category lists Koni Sport shocks with adjustable damping and height, front and rear, and a RoadsterSport suspension package; I read the category listing, not the product pages | 2016-2026 ND |
What owners said
- An NB with about 100,000 miles (July 2016). An owner of a 2001 SE with worn dampers asked for the best original-style shocks with stock springs. One reply said the Koni STR.T is no better than a KYB and costs more. Another ranked the STR.T at the bottom of a shock list, said the street Konis had reliability issues and no longer match the design that built Koni's name, rated a cheaper brand a cut above, and said genuine Mazda shocks wear out at about 40,000 miles. (Miata.net thread; first page, which is individual opinion.)
- An NC with 84,000 miles (June 2021). An owner of a 2006 Sport said a 1,300-mile drive made his head bounce like a bobblehead, and asked whether to fit new Bilsteins with lowering springs or stock springs with Koni STR.Ts. One reply said not to keep the stock springs, which he called the main reason the ride is mushy; another said he runs stock springs with Koni street shocks and called it a good ride; and a third said the Konis would lower the car about half an inch less than aftermarket Bilsteins with lowering springs and ride more comfortably. (Miata.net thread; first page.)
Search results for other Miata.net threads say the NC's factory Bilstein sport shocks are widely regarded as poor, and that Koni street shocks ride closer to stock while Bilstein B6 rides firmer; I did not read those threads, so treat them as leads.
Not covered yet
- Springs and sway bars (end links, bushings), and the ND beyond Good-Win's listing.
- Owner accounts for the ND, and what is the best match for stock ride on each generation, which owners disagree about.
© 2026 Fischer Interactive LLC. Written for the Ref Sensor app's Miata users. The seller's page is the authority.