DMR lists two front knuckles and puts the reasoning in a video

This is the background, not DMR's claim. On most 1/10 RWD drift chassis the front knuckle carries the axle and the steering arm, and its pivot positions decide a cluster of things at once:

• KPI, set by the line between the upper and lower pivots, which affects how the front end behaves as steering angle builds.
• Scrub, the offset between that axis and the tire's contact patch, which changes how much the front wheel loads the chassis at full lock.
• Steering link position, which feeds Ackermann and how the two front wheels relate to each other deep into counter-steer.
• Mechanical steering angle, since the knuckle body and arm usually decide where the lock physically stops.
• Upper pivot height, which works with the upper arm mount to set camber change through travel.

A "high-upper" name in this scene generally points at that last group, but the shop text does not state the dimensional difference between DMR's two versions, and the video is where the maker explains his own choices. Treat any number you have not seen printed by DMR as not confirmed.

Both parts are on DMR's own BASE shop: the DMR front knuckle, normal type and the DMR front knuckle, high-upper type. The description gives the names and the links and nothing more; it does not say which chassis or which upright standard they bolt to, and it does not state a price.

What the rest of the shop does tell you is the platforms DMR builds for. The same page lists a fourth-lot pre-order of the RD2.0/SD2.0 DMR conversion Shura, and DMR has also listed a fifth-lot pre-order of an RDX DMR conversion called JAPAN along with an RDX DMR motor mount. Lot dates are not stated in the material. That is a maker working around Yokomo's RD2.0 and SD2.0 and Reve D's RDX — but a conversion for a chassis is not the same statement as fitment for that chassis's front knuckles, so confirm it on the listing.

If you want to compare your own front end before ordering, the maker documents are on our manuals pages: Yokomo RD2.0, Yokomo SD2.0 and Reve D RDX, including the RD2.0 exploded view and the RDX development view.

The reason this posting is worth reading closely is who is behind it. DMR runs DMR WIN'S JAPAN, described in its own material as a large circuit, at 439-1 Minamitamatsukuri, Tako-machi, Katori-gun, Chiba, open weekends and holidays from 10:00 to 00:00. The circuit site carries the venue details. DMR has also posted a challenge video around what it calls the world's longest straight at the same circuit; that is DMR's own label, and the material does not put a measurement to it.

That pairing — a track operator who sells the parts he develops on it — is a familiar route for Japanese drift parts, and it sets the terms for how you read this release. The knuckle's evidence base is one maker's sessions at one venue on that venue's surface, which the material does not name, rather than a published test program.

If you already run a DMR conversion, or you are on an RD2.0, SD2.0 or RDX and you follow Japanese-language build content, the video is the part of this release with the actual information in it, and the two listings are live now on DMR's shop.

If you want printed geometry figures before you spend — KPI change, caster change, how much extra lock, what the high-upper version moves and by how many millimeters — the posted text does not supply them, and picking a knuckle off a product name is how people end up rebuilding a front end twice. Ask the shop, or watch the explanation before ordering.