USFS National Forest System Trails · Bridger-Teton National Forest · Wyoming · Updated June 2026
Breakneck Flat Spur B (USFS trail 4303) is a 1 mi trail in Bridger-Teton National Forest, Wyoming. Mountain-bike use here is accepted but discouraged in USFS data, with Class 1 e-bikes also designated.
Can I bike Breakneck Flat Spur B?
| Use | Status | Season on record |
|---|---|---|
| Mountain bike | Accepted but discouraged | — |
| Class 1 e-bike (pedal-assist, 20 mph) | Allowed | Jun–Nov |
| Class 2 e-bike (throttle, 20 mph) | Allowed | Jun–Nov |
| Class 3 e-bike (pedal-assist, 28 mph) | Allowed | Jun–Nov |
Zooming out: across Bridger-Teton National Forest, 53% of rideable trail miles are open to mountain bikes — a Bike Access Grade of B.
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About this trail
Breakneck Flat Spur B (USFS trail 4303) runs 1 mi through Bridger-Teton National Forest in Wyoming. The figures here are pulled from the official US Forest Service trail data for Bridger-Teton National Forest, covering the trail's mileage, tread, grade band, and the bike and e-bike uses the agency lists as designated. USFS records list its surface as native material. No grade band is recorded, so a steepness-based difficulty isn't available for this trail. For traditional mountain bikes, use is discouraged according to USFS data. On the electric side, Class 1, Class 2, Class 3 e-bikes are also designated (Jun–Nov) — Class 1 being pedal-assist only, Classes 2 and 3 adding a throttle and higher assisted speed. The route is mapped as USFS Trail Class 4 on the agency's 1-to-5 development scale, where 1 is the most primitive, minimally maintained tread and 5 is the most developed. Treat this as a planning reference rather than a live conditions report, and verify any time-sensitive closure or order with the ranger district that manages Bridger-Teton National Forest.
Frequently asked questions
- Can you mountain bike on Breakneck Flat Spur B?
- Mountain-bike use on Breakneck Flat Spur B is discouraged in USFS records, though Class 1 e-bike use is designated. Confirm current rules with the managing ranger district.
- Are e-bikes allowed on Breakneck Flat Spur B?
- Class 1, Class 2, Class 3 e-bikes are designated on Breakneck Flat Spur B in the USFS data.
- How long is Breakneck Flat Spur B?
- Breakneck Flat Spur B measures about 1 mi in total, summed across its mapped National Forest System segments.
- What is the surface of Breakneck Flat Spur B?
- USFS data records the tread surface of Breakneck Flat Spur B as native material.
How we read this data
Grade-based difficulty above is the USFS grade (route steepness), not a technical mountain-bike rating — a gentle-grade trail can still be rocky or technical, and vice versa. Bike and e-bike status come verbatim from the USFS managed-use fields for this trail; we never infer access we can't cite. See our methodology for how the dataset is built and what each field means.
Where it is
Approximate location of Bridger-Teton National Forest (USFS trail geometry isn't mapped).
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