Bike models › Gravel
Ozark Trail G.1 Explorer Drop Bar: specs, upgrades and what fits
Walmart's budget aluminum gravel bike with drop bars, a 2x7 drivetrain, mechanical disc brakes and wide 40 mm tires (45 mm on size L). Best for: Cheap entry into gravel, commuting and light bikepacking.
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My take, from the specs
A very cheap way into gravel riding, commuting and light bikepacking, with drop bars, wide tires and plenty of mounts. The mechanical discs and 2x7 drivetrain work but are basic, and the 7-speed freewheel limits gearing upgrades. Check which version you have, since early 2024 bikes came with a steel fork and 40 mm tires.
Sizes: S: 5′1″–5′5″ (155–165 cm) · M: 5′5″–5′10″ (165–178 cm) · L: 5′10″–6′3″ (178–191 cm)
Stock specs
| Type | Gravel |
|---|---|
| Year | 2024 |
| Price when new | $278 |
| Sold at | Walmart |
| Wheels | 700c × 40 mm tires |
| Gears | 2×7 · 46/30T · 14–28T |
| Brakes | Generic Mechanical disc, road-pull |
| Fork | Ozark Trail Rigid aluminum, QR, nutserts (early 2024 bikes had a steel fork) |
| Rear derailleur | Shimano Tourney RD-TY300, 7-speed (some listings say TZ500) |
| Shifter | L-TWOO 2x7 combined brake/shift levers |
| Crank | Generic Steel double, 170 mm |
| Bottom bracket | Neco BC35, 122.5 mm one-piece cartridge |
| Axles | Quick release |
| Seatpost | 27.2 mm |
| Weight | 30.4 lb (13.8 kg) |
| Sizes | S, M, L |
| Stock colors | Green |
Upgrade limits
How far each part can go on this frame, and why. Measure your own bike to confirm the estimated ones.
| Part | Limit | Why |
|---|---|---|
| Widest tire (current wheel size) | 45 mm | No measurement yet. Estimate from owner reports and frame design. Your 19 mm internal rims suit roughly 28–49 mm tires. |
| Other wheel sizes | 650b up to ~52 mm | Disc brakes don't care where the rim sits, so a 650b wheel with a fatter tire fits. A 650b × 47 is about the outer size of a 700 × 28, so the bottom bracket sits about 12 mm lower than on 700 × 40 (watch pedal strikes). |
| Tubeless | Not recommended | Tubeless needs a rim built to seal (bead hook + channel) and tubeless-ready tires. |
| Valve type | Presta | Decides which tubes and pump heads fit. Presta tubes fit Schrader rims with a grommet; not the other way. |
| Replacement wheels | Quick release · 100/135 mm · 6-bolt disc | Any wheel matching axle type, spacing and brake mount fits. Rear also needs the right freehub. |
| Biggest rear cog | 28T (now 28T) | Set by the rear derailleur (Shimano Tourney RD-TY300): max low sprocket 28T, total capacity 34T. A hanger extender can add a few teeth (hit-or-miss on non-Shadow derailleurs); a new derailleur is the reliable way to get more. |
| Front gears | 2x (46/30T) · needs 30T capacity | A 2x drivetrain needs a front derailleur and left shifter. Your rear derailleur must take up (biggest − smallest ring) + (biggest − smallest cog) = 30T; yours handles 34T. Going 1x drops the front derailleur: simpler and quieter, with a slightly smaller range. |
| Chainring size | Unknown (now 46T) | Estimated from similar frames. Measure the chainring-to-chainstay gap to confirm. Check whether your ring is bolted or riveted. Spindle length (122.5 mm) sets chainline; a big change in ring size may need a different BB spindle. |
| Gear count upgrades | Freewheel (≤8) | Threaded freewheel: up to 7/8-speed freewheels only. More speeds needs a new rear wheel with a freehub. |
| Cranks & bottom bracket | Square taper · 68 mm shell · 122.5 mm spindle | Any square-taper crankset fits with the right spindle length. Upgrading to Hollowtech II needs a new BB (same threaded shell). |
| Pedal thread | 9/16" × 20 | Every adult multi-piece crank uses 9/16". One-piece kids/cruiser cranks use 1/2". |
| Brake pads | Shape unknown | Disc pads only fit calipers with the matching shape. |
| Rotor size | 160/160 mm now · front up to 180 mm | 6-bolt rotors. Going bigger needs a caliper adapter: adapter type depends on the mount (post, IS or flat). Most steel forks allow 180 mm; check the fork if a max rotor is printed on it. |
| Caliper upgrades | Road-pull mechanical | Road levers need road-pull calipers. |
| Stems & bars | 1-1/8 steerer · 31.8 mm bar clamp | Any stem for a 1-1/8 steerer with a 31.8 mm clamp fits. You can cut a bar narrower but not wider. |
| Seatposts | 27.2 mm | 27.2 mm is the most common size: suspension posts and external-cable dropper posts are easy to find. Internal droppers need internal routing the frame does not have. |
| Racks, fenders, bottles | Rack ✓ · Fender ✓ · 2 bottle · Fork cargo ✓ | Threaded eyelets at the dropouts and seat stays take a rack and fenders. Fork leg mounts take cargo cages. |
| Max load (rider + cargo) | 220 lb | Wheels are usually the weak point under heavy loads. Stay under this with rider plus luggage. |
Best upgrades by area
Three options that fit the Ozark Trail G.1 Explorer Drop Bar as-is in each area, from budget to best. ★ marks the one most worth the money. How we pick. Typical US prices, checked October 2026. They change often: check the price at the store.
Upgrades that fit as-is
Tires
- Panaracer GravelKing Slick 700x35 (pair), $$$. 35 mm tire ↔ your ~45 mm clearance
- Kenda Kwest 700x35 (pair), $$. 35 mm tire ↔ your ~45 mm clearance
- WTB Byway 700x40 (pair), $$$. 40 mm tire ↔ your ~45 mm clearance
- Panaracer GravelKing SK 700x40 (pair), $$$. 40 mm tire ↔ your ~45 mm clearance
- Schwalbe Marathon 700x38 (pair), $$$. 38 mm tire ↔ your ~45 mm clearance
- Continental Grand Prix 5000 700x28 clincher (pair), $$$. 28 mm tire ↔ your ~45 mm clearance
- Continental Ultra Sport III 700x28 folding (pair), $$. 28 mm tire ↔ your ~45 mm clearance
- Michelin Power Cup 700x28 clincher (pair), $$$. 28 mm tire ↔ your ~45 mm clearance
- Panaracer Pasela 700x32 wire (pair), $$$. 32 mm tire ↔ your ~45 mm clearance
- Panaracer GravelKing Slick 700x32 (pair), $$$. 32 mm tire ↔ your ~45 mm clearance
- Continental Grand Prix 5000 700x32 clincher (pair), $$$. 32 mm tire ↔ your ~45 mm clearance
- Panaracer Pasela 700x35 wire (pair), $$$. 35 mm tire ↔ your ~45 mm clearance
- Panaracer Pasela 700x38 wire (pair), $$. 38 mm tire ↔ your ~45 mm clearance
- Schwalbe Marathon Almotion 700x38 (40-622) V-Guard Addix (pair), $$$. 38 mm tire ↔ your ~45 mm clearance
- Continental Contact Urban 700x40 (40-622) wire (pair), $$$. 40 mm tire ↔ your ~45 mm clearance
- Panaracer GravelKing Slick 700x40 (2025, pair), $$$. 40 mm tire ↔ your ~45 mm clearance
- WTB Riddler 700x37 TCS Light (pair), $$$. 37 mm tire ↔ your ~45 mm clearance
Tubes
- RideNow TPU gravel tubes 700x32-47 Presta (pair), $$. 700c wheel size matches · Presta valve ↔ your Presta rims
- Thorn-resistant tubes 700x35-43 (pair), $. 700c wheel size matches
- Continental Tour 28 All 700x32–47 Presta 42 mm tubes (pair), $. 700c wheel size matches · Presta valve ↔ your Presta rims
- Tubolito Tubo-CX/Gravel-All 700x30–50 Presta 42 mm (pair), $$. 700c wheel size matches · Presta valve ↔ your Presta rims
Comfort
- 35° rise 60 mm stem, $. 1-1/8" steerer matches · Get the 31.8 mm clamp version for your bar
- Suspension seatpost 27.2 mm (budget), $$. 27.2 mm post ↔ your 27.2 mm seat tube
- Redshift ShockStop suspension seatpost 27.2, $$$$. 27.2 mm post ↔ your 27.2 mm seat tube
- WTB Volt saddle, $$. Medium-width shape that suits most riders. Measure sit bones if comfort is the goal.
- Brooks C17 All Weather saddle, $$$. Vulcanized rubber top that flexes like a hammock, and this All Weather version is fully waterproof. No break-in like leather. Firm, not padded: made for long…
- Bikeroo oversized comfort saddle, $. Wide, soft and sprung for short upright rides on cruisers and hybrids. On rides over an hour wide padding can chafe; a firmer saddle that fits your sit bones…
- Cinelli Cork Ribbon bar tape, $. Made for drop bars ↔ your drop bar
- Selle Royal Respiro Moderate saddle, $$$. Made for a 60° "moderate" back angle (most flat-bar hybrids). Very upright cruisers suit the wider Respiro Relaxed. Standard round steel rails.
- Fizik Terra Argo X5 saddle (150 or 160 mm), $$$. Pick 150 mm for narrower sit bones, 160 mm for wider. Round 7 mm alloy rails fit every standard clamp.
- Ergon SR Allroad Core Comp saddle (men's or women's), $$$. Comes in S/M and M/L widths (measure your sit bones) and men's and women's shapes. Round CroMo rails; 120 kg rider limit.
- Lizard Skins DSP V2 bar tape 2.5 mm, $$. Made for drop bars ↔ your drop bar
- Lizard Skins DSP V2 bar tape 4.6 mm, $$. Made for drop bars ↔ your drop bar
- Ritchey Comp 2-Bolt alloy seatpost 27.2 mm, $$. 27.2 mm post ↔ your 27.2 mm seat tube
- Thomson Elite seatpost 27.2 x 330 mm, $$$. 27.2 mm post ↔ your 27.2 mm seat tube
- Ergon CF Allroad Pro Carbon flex seatpost 27.2 mm, $$$$. 27.2 mm post ↔ your 27.2 mm seat tube
- Cirrus Kinekt 2.1 Aluminum suspension seatpost 27.2 mm (LR or XR spring), $$$$. 27.2 mm post ↔ your 27.2 mm seat tube
- Redshift ShockStop suspension stem 31.8 (±6° or +30°), $$$. 1-1/8" steerer matches · Threadless stem ↔ your threadless steerer
- Redshift ShockStop PRO suspension stem 31.8 (±6°), $$$$. 1-1/8" steerer matches · Threadless stem ↔ your threadless steerer
Control
- External dropper post 27.2 mm, 100 mm drop + remote, $$$. 27.2 mm post ↔ your 27.2 mm seat tube
- Race Face Chester composite flat pedals, $$. Big platform with pins. Feet stay put on bumps and in rain. Install with an 8 mm hex key (no wrench flats).
- ROCKBROS aluminum flat pedals, $$. Budget metal platform with pins. A big step up from stock plastic.
- Shimano PD-M520 SPD clipless pedals (cleats included), $$. Nearly indestructible two-sided SPD pedals. You also need SPD (2-bolt) shoes, about $60–100 more. Set the release tension low and practice unclipping before…
- Crankbrothers Stamp 2 aluminum flat pedals (small or large), $$$. Sized by shoe: small for US men's 5–10, large for 10 and up. Grease the threads and tighten to about 35 Nm.
- OneUp Components Aluminum flat pedals, $$$. Bearings and bushings can be serviced with a cheap kit instead of replacing the pedal. Grease the threads and tighten to about 35 Nm.
- Shimano PD-EH500 dual-sided SPD / flat pedals (cleats included), $$$. Comes with SM-SH56 multi-release cleats, which are easier to get out of in a panic. You still need 2-bolt SPD shoes to clip in.
- Shimano Deore XT PD-M8100 SPD pedals (cleats included), $$$. Cup-and-cone bearings are fully serviceable and last for years. Shoes with a 2-bolt SPD cleat sold separately.
- KS eTen-R external dropper 27.2 mm, 100 mm drop + KS Southpaw remote, $$$. 27.2 mm post ↔ your 27.2 mm seat tube
- PNW Components Pine external dropper 27.2 mm (90 or 110 mm) + PNW Loam lever, $$$$. 27.2 mm post ↔ your 27.2 mm seat tube
Utility
- Topeak Explorer rear rack (disc mount), $$. Uses your frame's rack mounts
- USB rechargeable front + rear light set, $$. Daytime flashing lights cut collisions. Required by law at night.
- Pletscher adjustable kickstand, $$. Handy for errands. Check it clears the rotor and chainstay.
- Lisen clamp-style handlebar phone mount, $. Cheap and tool-free for maps on paved rides. On rough gravel or trails a locking mount (Quad Lock or Peak Design, about $45–70 plus a case) is much safer.
- Topeak TopLoader top tube bag (0.75 L), $$. Keeps snacks, keys and a multi-tool within reach. Straps on, with a rain cover. Check your knees do not rub it when you stand up.
- Knog Oi Classic bell, $. Slim ring bell that wraps the bar. Large fits 23.8–31.8 mm bars; Small fits 22.2 mm kids and BMX bars. Required by law in some places.
- Planet Bike Beamer 200 + Blinky Squared USB light set, $$. USB rechargeable, tool-free mounts. Use flash mode in daylight. Rear light is 30 lumens: good for town, modest on fast roads.
- Cygolite Metro Plus 800 + Hotshot Pro 150 USB light set, $$$. Nine headlight modes including a daytime flash. Aim the beam slightly down so you do not blind oncoming riders.
- Trek (Bontrager) Ion Pro RT + Flare RT light set, $$$. Daytime-running flash modes on both lights. ANT+ lets a Garmin or Wahoo show battery and switch them. Full power runs about 1.5 hours; medium lasts much longer.
- Topeak Super Tourist DX Tubular rear rack (disc), $$$. Uses your frame's rack mounts
- Tubus Disco steel rear rack for disc brakes (26" or 28"/700c), $$$. Uses your frame's rack mounts
Drivetrain
- KMC X8 8-speed chain with Missing Link, $. 6/7/8-speed chain ↔ your 7-speed drivetrain
- KMC Z7 6/7-speed chain (116 links), $. 6/7-speed chain ↔ your 7-speed drivetrain
- KMC Z8.3 6/7/8-speed chain (116 links), $. 6/7/8-speed chain ↔ your 7-speed drivetrain
- KMC X8 EPT 6/7/8-speed anti-rust chain with Missing Link, $$. 6/7/8-speed chain ↔ your 7-speed drivetrain
Brakes
- Shimano SM-RT56 160 mm 6-bolt rotor (1 rotor), $. Disc-brake part ↔ your disc brakes · 160 mm rotor ↔ your 160 mm front rotor
- Galfer Wave 160 mm 6-bolt rotor, 1.8 mm (1 rotor), $$. Disc-brake part ↔ your disc brakes · 160 mm rotor ↔ your 160 mm front rotor
- Shimano SM-RT86 Ice-Tech 160 mm 6-bolt rotor (1 rotor), $$. Disc-brake part ↔ your disc brakes · 160 mm rotor ↔ your 160 mm front rotor
Gearing
- Shimano Tourney MF-TZ500-7 7-speed freewheel 14–28, $. 7-speed ↔ your 7-speed drivetrain · 28T biggest cog ↔ your derailleur's 28T max
- SunRace 7-speed freewheel 13-28 (MFM3S), $. 7-speed ↔ your 7-speed drivetrain · 28T biggest cog ↔ your derailleur's 28T max
- Shimano Acera RD-M3020-8 SGS 7/8-speed rear derailleur (40T max), $$. 7-speed ↔ your 7-speed drivetrain · Shimano cable pull ↔ your shifter
Fits with small changes (12)
- Continental Ultra Sport III 700x25 folding (pair), $$. Outside the ideal range for your 19 mm rims (28–49 mm): it will mount, but the shape is less stable.
- Michelin Power Cup 700x25 clincher (pair), $$$. Outside the ideal range for your 19 mm rims (28–49 mm): it will mount, but the shape is less stable.
- Continental Grand Prix 5000 700x25 clincher (pair), $$$. Outside the ideal range for your 19 mm rims (28–49 mm): it will mount, but the shape is less stable.
- Stan's NoTubes tire sealant 16 oz, $. In tubes: needs tubes with removable valve cores (Presta or Schrader to match your rims).
- Orange Seal Endurance tubeless sealant 16 oz, $. In tubes: needs tubes with removable valve cores (Presta or Schrader to match your rims).
- SILCA Ultimate Tubeless Sealant 16 oz, $. In tubes: needs tubes with removable valve cores (Presta or Schrader to match your rims).
- Shimano SM-RT56 180 mm 6-bolt rotor (1 rotor), $. Your front rotor is 160 mm: a 180 mm rotor fits with a post +20 mm caliper adapter (check your fork's max rotor size).
- Galfer Wave 180 mm 6-bolt rotor, 1.8 mm (1 rotor), $$. Your front rotor is 160 mm: a 180 mm rotor fits with a post +20 mm caliper adapter (check your fork's max rotor size).
- Shimano SM-RT86 Ice-Tech 180 mm 6-bolt rotor (1 rotor), $$. Your front rotor is 160 mm: a 180 mm rotor fits with a post +20 mm caliper adapter (check your fork's max rotor size).
- Kalloy Uno SP-602 alloy seatpost 25.4 x 350 mm, $. Your seat tube takes 27.2 mm: needs a 25.4→27.2 shim.
- Thomson Elite seatpost 25.4 x 330 mm, $$$. Your seat tube takes 27.2 mm: needs a 25.4→27.2 shim.
- Sunlite adjustable suspension seatpost 25.4 mm, $$. Your seat tube takes 27.2 mm: needs a 25.4→27.2 shim.
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Buying one used? Fair prices
Worked out from the price new ($278), age and condition, not live market data. If it needs tires, a chain or brakes, take off what fixing them would cost.
| Condition | 1 year old | 3 years old | 5 years old |
|---|---|---|---|
| Like new | $130–$170 | $95–$125 | $70–$90 |
| Good | $115–$150 | $85–$110 | $60–$80 |
| Fair | $95–$125 | $70–$90 | $50–$65 |
| Needs work | $70–$95 | $50–$70 | $40–$50 |
See what these really sold for on eBay · Other used bike prices
Geometry (size M (19 in))
| Stack | 572° |
|---|---|
| Reach | 395 mm |
| Head angle | 71.5° |
| Seat angle | 73.5° |
| Chainstay | 440° |
| BB drop | 78 mm |
| Wheelbase | 1046 mm |
| Head tube | 120 mm |
| Seat tube | 500 mm |
| Standover | 762° |
Compare with
- Specialized Diverge 3 Alloy (Diverge E5, Shimano CUES) · compare frames side by side
- Giant Revolt 2 · compare frames side by side
- Cannondale Topstone 4 · compare frames side by side
- Trek Checkpoint ALR 4 · compare frames side by side
Sources: Walmart: G.1 Explorer Drop Bar, Medium 19 in (current specs) · Walmart: G.1 Explorer Drop Bar, Small 49 cm · Walmart: G.1 Explorer Flat Bar, Medium (shared frame and wheel details) · Bike Insights: 2024 G.1 Explorer geometry, all sizes · Bike Insights: 2024 G.1 Explorer Medium · Ruaka Cycle Mart: G.1 Explorer drop bar spec list (2024 build) · John M Flores: bikepacking prep on the G.1 (presta valves, mounts) · MTBR owner thread: Walmart Ozark Trail G1 (30/46 rings)