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This week’s Stash Brief leads with a deadline: the National Park Service bike and e-bike rule closes for comments Monday. Also: Colorado draws a hard line between e-bikes and e-motos, Amflow’s removable-battery e-MTB lands in the US, Trek’s 32-inch XC hardtail shows up in public, and the 2027 World Cup calendar ends in our backyard.

National parks bike rule: comment by Monday, Nov 2

The NPS has proposed a rule, “Bicycle Use in Park Areas,” that would cut the procedural steps parks need to designate roads and trails for bikes. NPS says it would create “a clear and consistent baseline” for bike and e-bike use on park roads, parking areas and trails.[1] It was published Sept 1 (91 FR 56095, docket NPS-2026-0166), and comments must be received by 11:59 p.m. ET on Monday, Nov 2.[2]

Leave a comment here: regulations.gov/commenton/NPS-2026-0166-0001

Why it matters: this decides how fast new singletrack inside parks can open to bikes, and how e-bikes fit in. Whatever your take, a specific comment beats silence. For how e-bike classes work on Colorado ground today, see our Colorado e-bike laws guide.

Colorado: mod it past 28 mph or 750 W and it’s a motorcycle

Colorado State Patrol’s “Chasing More Power” release says modifying an e-bike past 28 mph or 750 W may legally reclassify it as a moped or motorcycle. That means DMV registration, insurance, a minimum age of 16 and a motorcycle endorsement. CSP also flags riders pulling chains and removing brake motor-cutoff switches, and says teen modifications should be done by a professional.[3]

In Denver, residents told Denver7 about large weekend groups of e-bike and e-moto riders taking over streets; one viewer estimated a South Broadway group at more than 200 riders. Children’s Hospital Colorado said traumatic e-bike injuries at its Anschutz campus rose 184% from 2024 to 2025. A CSP trooper urged parents to check specs before buying a holiday gift.[4] New Jersey is moving the same direction from the other side: Sen. Raj Mukherji’s bill S4830 would drop license and registration requirements for Class 1 and 2 e-bikes and keep them for Class 3. It’s proposed, not passed.[5]

Why it matters: the class label is the whole ballgame. If a “kids’ e-bike” gift tops 750 W or 28 mph, it’s a motorcycle in Colorado. Check the spec sheet first, and see our Colorado e-bike laws guide.

Amflow PR lands in the US, and what Eco vs Turbo really costs you

Amflow’s PR Carbon ($4,999, Avinox M2, up to 125 Nm) and PR Carbon Pro ($6,799, Avinox M2S, up to 150 Nm) went on sale in the US Oct 26 through amflowbikes.com and authorized dealers. Both use Avinox’s first removable battery, 800 Wh. Amflow claims the pack weighs as little as 4 kg and gives up to 158 km of range, measured in Eco on flat pavement with an 80 kg rider.[6]

Pinkbike’s Seb Stott put real dirt numbers on that motor family. On a YT Decoy with the Avinox M2S and an 800 Wh battery, a 325 m climb used 11% of the battery in Eco and 22% in Turbo, which projects to about 2,955 m of climbing versus 1,477 m. Eco took 18:41; Turbo took 8:22. Trail mode was only about 4% slower than Turbo and gave about 20% more range. It’s one rider on one hill, and Stott says systems with milder Turbo settings should show a smaller gap.[7]

Why it matters: a removable pack at $4,999 puts the PR right in our $5k tier, and the range test says Trail mode is the sweet spot for big-vert days. See how it stacks up in our full-power e-MTB shootout.

Trek’s 32-inch XC hardtail is out in the open

A Wisconsin NICA athlete photographed a 32-inch carbon hardtail, presumably the Procaliber, at the state championship in Waterloo, home of Trek’s HQ. The headline part is the fork: an unreleased 32-inch Fox 34 that Pinkbike says appears to be a production model with its own casting. The build ran SRAM XX SL Transmission, a Reverb AXS dropper and Maxxis Aspen tires. A 32-inch full-suspension Trek was shown too. No name, price, geometry or launch date yet.[8]

Why it matters: this is a spotted prototype, not a launch. But a 32-inch Fox fork means a major suspension brand is tooling up, and that’s what turns a wheel size from experiment into something you can actually build. Don’t sell your 29er yet.

2027 World Cup ends a day’s drive from Colorado

The 2027 WHOOP UCI Mountain Bike World Series runs 10 rounds, starting May 21 in Nové Město, Czechia. Both formats finish in North America: the XC World Cup wraps Sept 25–26 at Soldier Hollow in Midway, Utah, and the downhill finale is Oct 2–3 at Whistler Mountain Bike Park.[9]

Why it matters: World Cup XC is a road trip, not a plane ticket, for Front Range riders. Mark late September now.

Evidence: every fact above comes from the linked official notices, press releases and news reports; we did not ride or test these products.