DMR WIN'S JAPAN is rebuilding its layout around its longest straight

What is confirmed from the posting: DMR WIN'S JAPAN is a large circuit described by its operators as a ラジドリ+α venue, it sits at 439-1 Minami-Tamatsukuri, Tako, Katori District, Chiba, and it runs on weekends and public holidays from 10:00 to 0:00. The circuit keeps its own site.

What is not in the posting: the straight's measured length, the date the new layout takes effect, the surface the course runs on, and whether the venue mandates a spec tyre. None of those are stated, so none of them are reported here. A driver deciding between a Saturday and the following weekend would need the shop's own follow-up or a direct message to the circuit.

The "world's longest straight" line also has no second source in the material. Until one exists, it is best read as the circuit describing its own build, not a verified record.

A long straight changes the questions a 1/10 RWD car's setup has to answer, because for a stretch of the lap the car is doing one thing for an unusually long time before it has to transition.

The variables drivers typically weigh on a layout like this are gearing — the pinion and spur combination that sets the FDR — and how the straight feeds the corner at its end: entry point, initiation, and how much angle the lead car is willing to carry down a long run. In tandem, a long straight also stretches out the pacing problem, because the chase car has more distance in which to close or lose proximity before the next transition arrives.

None of that is specific to DMR WIN'S JAPAN yet. The video announces the change rather than walking through a finished layout, and it does not publish gearing advice, a recommended tyre or a diagram of the new course. Any setup claim about this specific straight should wait for the circuit's own follow-up or for drivers posting runs on it.

The same description lists DMR's own front knuckles in two versions, a normal type and a high-upper type, sold through the Mikasu-Works online shop. The listings are the normal type front knuckle and the high-upper type front knuckle, both on the Mikasu-Works shop.

The description does not state prices, chassis compatibility or what the high-upper geometry changes relative to the normal type, so those are open questions for the product pages themselves rather than things the video answers. Reported here as a sourced fact about what the circuit's operators sell, not as a recommendation.

The channel also runs a membership tier, linked from the same description, and the video credits its music as original.

The layout announcement is on the circuit's RC drift channel: 【ラジドリ】このあとレイアウト変更❗️世界一長いストレート on YouTube, posted by DMR Mikasu-Works. Credit for the footage and the announcement goes to that channel.