Yokomo offers a lot of drift springs — across four different lines — and on top of that, springs from several other brands drop right onto a YD-2. This guide lays out the full Yokomo lineup softest-to-hardest, explains how to actually read a spring so you can compare any two, and lists the aftermarket springs that fit.
How to read a Yokomo drift spring
Two numbers define a spring, and they do different jobs. Yokomo prints them as "wire × coils" — for example 1.2 × 9.5.
- Wire diameter (e.g. 1.1, 1.2, 1.3 mm) — the thickness of the wire itself. This is the main thing that sets the rate: a thicker wire is stiffer than a thinner one when length and coil count are equal.
- Coil count (e.g. 9.5, 10.5 turns) — how many turns are in the spring. With the same wire and length, fewer coils = stiffer. So a 9.5-turn spring is firmer than a 10.5-turn spring of the same wire.
- Free length — the uncompressed length (Yokomo's main drift springs are 32 mm). Length sets how much preload/ride-height range you have.
- Coil diameter — the overall width of the spring, side to side (a different thing from wire diameter). This is a fitment dimension: the spring has to seat on your shock body and spring cup. It does not change the rate.
So wire diameter and coil count set the stiffness; free length and coil diameter decide whether a spring fits your shock.
D-170 — 32 mm regular (equal) pitch
The everyday line. Equal pitch (linear rate), 32 mm, usable front or rear. Listed softest to hardest:
| Part # | Color | Wire × Coils | Relative rate |
|---|---|---|---|
| D-170BL | Blue | 1.1 × 10.5 | Softest |
| D-170BK | Black | 1.1 × 9.5 | Soft (same wire as blue, fewer coils) |
| D-170P | Pink | 1.2 × 10.5 | Medium (thicker wire than black) |
| D-170Y | Yellow | 1.2 × 9.5 | Medium-firm (same wire as pink, fewer coils) |
| D-170G | Green | 1.3 × 9.5 | Hardest (thickest wire) |
A "A" suffix (D-170BLA, D-170PA, etc.) is just the current 2-piece pack of the same spring.
D-171 — 32 mm progressive pitch
Same 32 mm length and same wire/coil specs as D-170, but these are progressive springs — they get firmer the more they are compressed (soft over small inputs, firmer as weight piles on). Yokomo calls this "unequal pitch." Four colors only — there is no black. Blue D-171BL (1.1 × 10.5) · Pink D-171P (1.2 × 10.5) · Yellow D-171Y (1.2 × 9.5) · Green D-171G (1.3 × 9.5). Many racers mix a D-170 and a D-171 front-to-rear to fine-tune feel.
Competition springs (going deeper)
Two short, position-specific competition systems — different from the 32 mm coilovers, sold mostly as sets:
- Direct-type set — D-180A (6 pieces): front D-177FA/FS, rear "forward" D-178RA/RS, rear "side-grip" D-179RA/RS. The A = all-round (carpet/asphalt), S = soft (P-tile/concrete). Yokomo publishes the function of each, not exact wire/coil specs.
- Progressive/linear competition set — D-185 (4 pieces): D-181R (1.3 × 28 mm, rear, progressive), D-182F (1.4 × 26.5, front, progressive), D-183F (1.5 × 26.5, front, progressive), D-184F (1.5 × 26.5, front, linear). Left bare/unpainted on purpose.
Will an aftermarket spring fit my YD-2?
To fit a YD-2 / RD / SD damper, a spring needs the right free length (~32 mm for the standard drift class) and the right coil diameter so it seats on your shock body and spring cup. A big-bore shock generally takes a larger coil-diameter spring — that is the spring's overall width, not a thicker wire. Wire diameter changes the rate, not the fit.
Match by spec, never by color. Every brand uses its own color code, so an MST "blue" and a Yokomo "blue" are nothing alike — compare wire diameter, coil count and length instead. And 1/10 touring-car springs are a different size and usually will not seat, so stick to springs sold as RWD-drift / 32 mm.
| Brand | Line / part #s | Spec | Notes |
|---|---|---|---|
| MST | 820106 (hard set), 820107 (medium set), 820108/109 (soft) | 1.3 mm wire, 32 mm | The most-used swap. Heavier wire than most Yokomo springs, so an MST "soft" can land near a Yokomo medium — match by spec. |
| Reve D | RD-010RM / RMH / RH, RD-010AS set | ~9.5–10 coils, 32 mm | Sold specifically for the YD-2 — Reve D is the YD-2 tuning house. |
| Usukani / KN | KN-DS57 set (DS58–DS67) | 1.2 mm wire, 10.25–12.5 coils in 0.25 steps | The finest-grained range out there — 10 rates. |
| RC-ART | HP Spring 32 (ART3057–3062) | 32 mm | Also 30/28/25 mm shorter springs for front/direct use. |
Brands like Yeah Racing, 3Racing, GL Racing, GPM and Hot Racing mostly sell shocks and hardware rather than their own spring lines — run Yokomo or MST springs in them. Overdose uses its own shorter twin-spring system that needs Overdose's own spring cups, so it is not a 32 mm drop-in.
One clarification: Yokomo "SLF" parts with codes like Y2-S3NRA are aluminum spring cups (the perch the spring sits on), not springs — don't read those red/purple codes as spring rates.
Related: Yokomo 1/10 off-road shock spring list.
