Bike models › Mountain
Mongoose Impasse 2.0 Dual 29: specs, upgrades and what fits
An aluminum full-suspension 29er with a 100mm QR fork, a 1x8 L-Twoo drivetrain (30T narrow-wide ring, 11-40 cassette) and mechanical disc brakes with a 180mm front and 160mm rear rotor. Walmart sells it for about $480; Mongoose lists $700. Best for: Rough neighborhood trails on a budget.
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My take, from the specs
A budget full-suspension 29er for rough neighborhood trails and easy dirt. The 1x8 drivetrain with an 11-40 cassette is simple, and the 180 mm front rotor helps the mechanical discs, but at about 16.4 kg with quick-release axles, a basic 100 mm fork and an unnamed rear shock it is best kept to mellow riding. It comes in one size, so make sure you fall inside the published height range.
Sizes: One size (17 in): 5′5″–6′0″ (165–183 cm)
Stock specs
| Type | Mountain |
|---|---|
| Year | 2025 |
| Price when new | $480 |
| Sold at | Walmart / mongoose.com |
| Wheels | 700c × 57 mm tires |
| Gears | 1×8 · 30T · 11–40T |
| Brakes | Mongoose Mechanical disc, 180mm rotor |
| Fork | Element 29in, 100mm travel, 100mm QR |
| Rear derailleur | L-Twoo RD-T800, 8-speed |
| Shifter | L-Twoo SL-V5008-8, 8-speed |
| Crank | Prowheel Aluminum, 30T |
| Bottom bracket | Generic Square taper (shell width not listed) |
| Axles | Quick release |
| Seatpost | 27.2 mm |
| Weight | 36.2 lb (16.4 kg) |
| Sizes | One size (17 in) |
| Stock colors | Black/Blue |
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) | 57 mm | Unknown until measured. Your 30 mm internal rims suit roughly 44–78 mm tires. |
| Other wheel sizes | 650b up to ~64 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 | Schrader | 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. |
| Front gears | 1x (30T) | One ring, no front derailleur. Adding a front derailleur needs a mount on the seat tube and a 2x crankset, so most riders change the ring size or cassette instead. |
| Chainring size | Unknown (now 30T) | Estimated from similar frames. Measure the chainring-to-chainstay gap to confirm. Check whether your ring is bolted or riveted. Spindle length (? mm) sets chainline; a big change in ring size may need a different BB spindle. |
| Gear count upgrades | 8 → 9 or 10 speed | Shimano HG 8/9/10-speed freehub: takes 8, 9 or 10-speed cassettes, Shimano 11-speed MTB and CUES/LinkGlide cassettes (7-speed needs a 4.5 mm spacer; most 11/12-speed road cassettes need an 11-speed road freehub, though the 11-34 HG700/HG800 fit). Shifter,… |
| Cranks & bottom bracket | Square taper · 68 mm shell · ? 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 | 180/160 mm now | 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 | Long-pull (MTB) mechanical | Your levers pull a lot of cable, so upgrade calipers must be long-pull (MTB) versions: TRP Spyke, Juin Tech M1, Avid BB7 MTB. Road calipers (TRP Spyre, BB7 Road) would feel mushy. |
| Stems & bars | ? 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. |
| Drop-bar conversion | Possible with mods | Needs road brake/shift levers (microSHIFT R8 makes 8-speed ones that pull Shimano 8-speed cable correctly), a drop bar, tape, and road-pull brake calipers because road levers pull less cable. Usually $250+. |
| 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 | No rack · No fender · 0 bottle | Threaded eyelets at the dropouts and seat stays take a rack and fenders. Fork leg mounts take cargo cages. |
| Max load (rider + cargo) | 300 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 Mongoose Impasse 2.0 Dual 29 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
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 180 mm 6-bolt rotor (1 rotor), $. Disc-brake part ↔ your disc brakes · 180 mm rotor ↔ your 180 mm front rotor
- Galfer Wave 180 mm 6-bolt rotor, 1.8 mm (1 rotor), $$. Disc-brake part ↔ your disc brakes · 180 mm rotor ↔ your 180 mm front rotor
- Shimano SM-RT86 Ice-Tech 180 mm 6-bolt rotor (1 rotor), $$. Disc-brake part ↔ your disc brakes · 180 mm rotor ↔ your 180 mm front rotor
Comfort
- Ergon GP1 ergonomic grips, $$. Made for flat bars ↔ your flat bar
- Budget ergonomic lock-on grips, $. Made for flat bars ↔ your flat bar
- Suspension seatpost 27.2 mm (budget), $$. 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, $$$. Made for flat bars ↔ your flat bar
Control
- External dropper post 27.2 mm, 100 mm drop + remote, $$$. 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, $$$$. 27.2 mm post ↔ your 27.2 mm seat tube
Utility
- USB rechargeable front + rear light set, $$. 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.
Tires
- WTB Riddler 700x45 TCS Light (pair), $$$. 45 mm tire ↔ your ~57 mm clearance
- Maxxis Ardent 29x2.25 EXO TR (pair), $$$. 57 mm tire ↔ your ~57 mm clearance
- Pirelli Cinturato Gravel M 700x45 (pair), $$$. 45 mm tire ↔ your ~57 mm clearance
- WTB Trail Boss Comp 29x2.25 wire (pair), $$. 57 mm tire ↔ your ~57 mm clearance
- Continental Race King ProTection 29x2.2 (pair), $$$. 55 mm tire ↔ your ~57 mm clearance
Drivetrain
- KMC X8 8-speed chain with Missing Link, $. 6/7/8-speed chain ↔ your 8-speed drivetrain
- KMC Z8.3 6/7/8-speed chain (116 links), $. 6/7/8-speed chain ↔ your 8-speed drivetrain
- KMC X8 EPT 6/7/8-speed anti-rust chain with Missing Link, $$. 6/7/8-speed chain ↔ your 8-speed drivetrain
Tubes
- Schwalbe AV19 29 x 1.5–2.4 Schrader 40 mm tubes (pair), $. 700c wheel size matches · Schrader valve ↔ your Schrader rims
- Slime self-sealing tubes 29 x 1.85–2.2 Schrader (pair), $$. 700c wheel size matches · Schrader valve ↔ your Schrader rims
Wheels
- WTB ST i30 TCS 29er disc rear wheel, QR 135, 6-bolt, HG 10, $$$. Disc-brake part ↔ your disc brakes · 700c wheel size matches
- Stan's NoTubes Crest S2 29 rear wheel, QR 135, 6-bolt, HG, $$$$. Disc-brake part ↔ your disc brakes · 700c wheel size matches
Gearing
- Shimano Acera RD-M3020-8 SGS 7/8-speed rear derailleur (40T max), $$. 8-speed ↔ your 8-speed drivetrain · Shimano cable pull ↔ your shifter
Fits with small changes (28)
- WTB Byway 700x40 (pair), $$$. Outside the ideal range for your 30 mm rims (44–78 mm): it will mount, but the shape is less stable.
- Panaracer GravelKing SK 700x40 (pair), $$$. Outside the ideal range for your 30 mm rims (44–78 mm): it will mount, but the shape is less stable.
- Schwalbe Marathon 700x38 (pair), $$$. Outside the ideal range for your 30 mm rims (44–78 mm): it will mount, but the shape is less stable.
- microSHIFT Advent 1x9 kit (shifter, clutch RD, 11–46 cassette) + 9-speed chain, $$$. Installs as a set: shifter, derailleur, cassette and chain together.
- Shimano BR-MT200 hydraulic brake set (pair, levers included), $$$. Replaces your brake levers. Your shifter stays.
- Continental MTB 29 x 1.75–2.5 Presta 42 mm tubes (pair), $. Presta valve: a Schrader rim needs a grommet so the valve sits snug.
- Shimano CUES U6000 1x11 kit (SL-U6000-11R shifter, RD-U6000 clutch RD, CS-LG400-11 11–50 LinkGlide cassette, chain), $$$$. Installs as a set: shifter, derailleur, cassette and chain together.
- Shimano BR-MT420 4-piston hydraulic brakes + BL-MT401 levers (pair), $$$. Replaces your brake levers. Your shifter stays.
- Wald 8095 swept touring handlebar 25.4 mm, $$. Clamp is 25.4 mm; your bike's is 31.8 mm. Needs a shim or a matching stem/bar.
- Sunlite Northroad Touring alloy handlebar 25.4 mm, 3.5" rise, $$. Clamp is 25.4 mm; your bike's is 31.8 mm. Needs a shim or a matching stem/bar.
- Nitto B352AA Albatross handlebar 25.4 mm, 55 cm, $$$. Clamp is 25.4 mm; your bike's is 31.8 mm. Needs a shim or a matching stem/bar.
- Panaracer Pasela 700x38 wire (pair), $$. Outside the ideal range for your 30 mm rims (44–78 mm): it will mount, but the shape is less stable.
- Schwalbe Marathon Almotion 700x38 (40-622) V-Guard Addix (pair), $$$. Outside the ideal range for your 30 mm rims (44–78 mm): it will mount, but the shape is less stable.
- Continental Contact Urban 700x40 (40-622) wire (pair), $$$. Outside the ideal range for your 30 mm rims (44–78 mm): it will mount, but the shape is less stable.
- Panaracer GravelKing Slick 700x40 (2025, pair), $$$. Outside the ideal range for your 30 mm rims (44–78 mm): it will mount, but the shape is less stable.
- WTB Riddler 700x37 TCS Light (pair), $$$. Outside the ideal range for your 30 mm rims (44–78 mm): it will mount, but the shape is less stable.
- Tubolito Tubo-MTB 29 x 1.8–2.5 Presta 42 mm (pair), $$. Presta valve: a Schrader rim needs a grommet so the valve sits snug.
- Stan's NoTubes tire sealant 16 oz, $. In tubes: needs tubes with removable valve cores (Presta or Schrader to match your rims).
- Orange Seal Endurance tubeless sealant 16 oz, $. In tubes: needs tubes with removable valve cores (Presta or Schrader to match your rims).
- SILCA Ultimate Tubeless Sealant 16 oz, $. In tubes: needs tubes with removable valve cores (Presta or Schrader to match your rims).
- Shimano Deore BL-M6100 + BR-M6100 2-piston hydraulic brake set (pair, levers included), $$$$. Replaces your brake levers. Your shifter stays.
- Shimano Deore BL-M6100 + BR-M6120 4-piston hydraulic brake set (pair, levers included), $$$$. Replaces your brake levers. Your shifter stays.
- Shimano SLX BL-M7100 + BR-M7120 4-piston hydraulic brake set (pair, levers included), $$$$. Replaces your brake levers. Your shifter stays.
- Shimano CUES U4000 1x9 kit (SL-U4000-9R shifter, RD-U4000, CS-LG300-9 11–46, CN-LG500 chain), $$$. Installs as a set: shifter, derailleur, cassette and chain together.
- Shimano Deore M5100 1x11 kit (SL-M5100 shifter, RD-M5100, CS-M5100 11–51, CN-HG601 chain), $$$. Installs as a set: shifter, derailleur, cassette and chain together.
- Kalloy Uno SP-602 alloy seatpost 25.4 x 350 mm, $. Your seat tube takes 27.2 mm: needs a 25.4→27.2 shim.
- Thomson Elite seatpost 25.4 x 330 mm, $$$. 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 ($480), 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 | $225–$295 | $165–$215 | $120–$155 |
| Good | $200–$260 | $145–$190 | $105–$135 |
| Fair | $165–$215 | $115–$155 | $85–$110 |
| Needs work | $125–$165 | $90–$120 | $65–$85 |
See what these really sold for on eBay · Other used bike prices
Compare with
- Hyper Bicycles Havoc 29 · compare frames side by side
- Giant Stance (2026, replaces Stance 2 in the US) · compare frames side by side
- Trek Fuel EX 5 Gen 7 · compare frames side by side
- Marin Rift Zone 1 (29) · compare frames side by side
Sources: Mongoose: Impasse 2.0 Dual 29in specs · Walmart: Impasse 2.0 (R5772; fit, weight, 11-40 cassette, price)