Bike models › Gravel / hybrid

Ozark Trail G.1 Explorer Flat Bar: specs, upgrades and what fits

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My take, from the specs

A good fit if you want a cheap flat-bar bike for paths, gravel and commuting, with rack and fender mounts and 40 mm tires. The Shimano Altus 1x8 with an 11-32 cassette keeps shifting simple, and the aluminum frame has a replaceable derailleur hanger. The single-piston mechanical discs need regular pad adjustment, and with a steel fork it weighs about 14 kg.

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

Upgrade limits

How far each part can go on this frame, and why. Measure your own bike to confirm the estimated ones.

Best upgrades by area

Three options that fit the Ozark Trail G.1 Explorer Flat 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

• Thorn-resistant tubes 700x35-43 (pair), $. 700c wheel size matches

Gearing

• Shimano CS-HG31-8 cassette 11–34, $. Cassette ↔ your Shimano HG freehub · 8-speed ↔ your 8-speed drivetrain
• Square-taper 1x narrow-wide crankset 44T 175 mm, $$. Bigger ring = higher top speed. Check chainstay clearance. Chain needs ~2 more links.
• Square-taper 1x narrow-wide crankset 38T 175 mm, $$. Smaller ring = easier climbing gears everywhere. Narrow-wide teeth hold the chain on bumps.
• SunRace CSM66 8-speed cassette 11–34 (nickel), $$. Cassette ↔ your Shimano HG freehub · 8-speed ↔ your 8-speed drivetrain
• Shimano Alivio CS-HG51-8 cassette 11–32, $$. Cassette ↔ your Shimano HG freehub · 8-speed ↔ your 8-speed drivetrain
• Shimano Acera RD-M3020-8 SGS 7/8-speed rear derailleur (40T max), $$. 8-speed ↔ your 8-speed drivetrain · Shimano cable pull ↔ your shifter
• Shimano CUES FC-U4000-1 square-taper 1x crankset 40T, $$. JIS square taper, 50 mm chainline, made for a 123 mm bottom bracket (the G1 has 122.5 mm, so the BB stays). Ring is riveted on. Shimano rates it for…
• Velo Orange Single Ring crankset with narrow-wide 42T (110 BCD, square taper), $$$. JIS square taper, 110 BCD 5-bolt ring (swap sizes later), 42 mm chainline on a 110 mm BB. On the G1's 122.5 mm BB the chainline sits about 6 mm further out,…

Brakes

• TRP Spyke mechanical disc calipers, long pull (pair), $$$$. Disc-brake part ↔ your disc brakes · Long-pull caliper ↔ your flat-bar (long-pull) levers
• Juin Tech M1 cable-hydraulic calipers, long pull (pair), $$$. Disc-brake part ↔ your disc brakes · Long-pull caliper ↔ your flat-bar (long-pull) levers
• Jagwire Mountain Pro brake cable kit (Kevlar KEB-SL housing), $$. Made for flat bars ↔ your flat bar
• Shimano Tourney BR-TX805 mechanical disc calipers, long pull, post mount (pair), $$. Disc-brake part ↔ your disc brakes · Long-pull caliper ↔ your flat-bar (long-pull) levers
• 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

Comfort

• Ergon GP1 ergonomic grips, $$. Made for flat bars ↔ your flat bar
• Budget ergonomic lock-on grips, $. Made for flat bars ↔ your flat bar
• 35° rise 60 mm stem, $. 1-1/8" steerer matches · Get the 31.8 mm clamp version for your bar
• Suspension seatpost 27.2 mm (budget), $$. 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.
• Race Face Chester riser bar 31.8 x 740 mm, 25 mm rise, $$. Made for flat bars ↔ your flat bar
• Brooks C17 All Weather saddle, $$$. 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…
• Ergon GA3 lock-on grips, $$. Made for flat bars ↔ your flat bar
• Selle Royal Respiro Moderate saddle, $$$. 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.
• Ergon GP5 ergonomic grips with built-in bar ends (S or L), $$$. Made for flat bars ↔ your flat bar
• Ritchey Comp 2-Bolt alloy seatpost 27.2 mm, $$. 27.2 mm post ↔ your 27.2 mm seat tube
• Thomson Elite seatpost 27.2 x 330 mm, $$$. 27.2 mm post ↔ your 27.2 mm seat tube
• Ergon CF Allroad Pro Carbon flex seatpost 27.2 mm, $$$$. 27.2 mm post ↔ your 27.2 mm seat tube
• Cirrus Kinekt 2.1 Aluminum suspension seatpost 27.2 mm (LR or XR spring), $$$$. 27.2 mm post ↔ your 27.2 mm seat tube
• Race Face Ride riser bar 31.8 x 710 mm, 25 mm rise, $$. Made for flat bars ↔ your flat bar
• SQlab 30X alloy riser bar 31.8 x 780 mm, 12° backsweep, $$$. Made for flat bars ↔ your flat bar
• Redshift ShockStop suspension stem 31.8 (±6° or +30°), $$$. 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.
• Wald 137 front basket, $$. Made for flat bars ↔ your flat bar
• Planet Bike Beamer 200 + Blinky Squared USB light set, $$. 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 8-speed drivetrain
• KMC Z8.3 6/7/8-speed chain (116 links), $. 6/7/8-speed chain ↔ your 8-speed drivetrain
• KMC X8 EPT 6/7/8-speed anti-rust chain with Missing Link, $$. 6/7/8-speed chain ↔ your 8-speed drivetrain

Wheels

• Weinmann Zac19 700c 6-bolt disc rear wheel, QR 135, 36H, HG 8–10 speed, $$$. Disc-brake part ↔ your disc brakes · 700c wheel size matches
• Shimano / DT Swiss R500 700c disc wheelset, QR 100/135, Center Lock, HG + 2 Shimano SM-RT54 160 mm Center Lock rotors, $$$$. Disc-brake part ↔ your disc brakes · 700c wheel size matches
• HUNT 4 Season Gravel Disc X-Wide wheelset (QR 100/135, HG, Center Lock) + 2 Shimano SM-RT64 160 mm Center Lock rotors, $$$$. Disc-brake part ↔ your disc brakes · 700c wheel size matches
• Stan's NoTubes Crest S2 29 rear wheel, QR 135, 6-bolt, HG, $$$$. Disc-brake part ↔ your disc brakes · 700c wheel size matches

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Buying one used? Fair prices

Worked out from the price new ($258), age and condition, not live market data. If it needs tires, a chain or brakes, take off what fixing them would cost.

See what these really sold for on eBay · Other used bike prices

Articles about this bike

• How much is a used bike worth? What I learned about pricing one
• The best first upgrades for a cheap bike (and what to skip): what I found as a beginner
• Walmart bike vs bike shop bike: what I found you really get for the money
• What size bike do I need? What I found as a beginner (height chart and fit check)

Sources: Walmart: G.1 Explorer Flat Bar, Medium · Shimano: Altus RD-M310 specs · Bike Insights: G.1 Explorer geometry (drop-bar base, used as stand-in) · MTBR owner thread: G1 upgrades