Bike models › BMX
Kink Curb 20": specs, upgrades and what fits
Kink's entry-level freestyle BMX with a 20-inch top tube, Hi-Ten frame and tapered-leg fork, 3-piece chromoly cranks, a 9-tooth cassette rear hub, a U-brake and wide 2.4-inch tires. Best for: Smaller or newer riders learning street and park.
Put this bike in your garageSee it in 3D
My take, from the specs
An entry freestyle BMX for smaller or newer riders learning street and park, with 3-piece chromoly cranks, a 9T cassette rear hub and wide 2.4-inch tires. The frame and fork are hi-ten steel, and the unsealed American bottom bracket and front hub need more care than sealed parts. It weighs about 12.3 kg, and the 20-inch top tube suits shorter riders.
Sizes: 20in: 4′10″–5′6″ (147–168 cm)
Stock specs
| Type | BMX |
|---|---|
| Year | 2027 |
| Price when new | $400 |
| Sold at | kinkbmx.com / BMX shops |
| Wheels | 20" × 61 mm tires |
| Gears | Single speed · 25/9 |
| Brakes | Mission Cease V2 U-brake, L3 linear cable |
| Fork | Kink Conduit, Hi-Ten steel, tapered legs, 30mm offset |
| Crank | Mission Triumph 3-piece tubular chromoly, 170mm, 8-spline |
| Bottom bracket | Mission Unsealed American loose-ball, 19mm spindle |
| Axles | Bolt-on |
| Weight | 27.1 lb (12.3 kg) |
| Sizes | 20in |
| Stock colors | Black Cherry, Midnight Black, Emerald 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) | 61 mm | Unknown until measured. Your 32 mm internal rims suit roughly 47–83 mm tires. |
| 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 | Bolt-on · 100/110 mm | Any wheel matching axle type, spacing and brake mount fits. Rear also needs the right freehub. |
| Brake pads (rim) | Threaded-post pads (V-brake / U-brake) | Rim brake pads are sorted by how they mount, which depends on the brake: threaded post with a nut (V-brakes, U-brakes), smooth post in an eye bolt (cantilevers), road cartridges (dual-pivot calipers) or short threaded pads (side-pull calipers). Any compound… |
| Front gears | 1x (25T) | 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 25T) | Estimated from similar frames. Measure the chainring-to-chainstay gap to confirm. Check whether your ring is bolted or riveted. Spindle length (19 mm) sets chainline; a big change in ring size may need a different BB spindle. |
| Gear count upgrades | Single speed | One cog and no derailleur. To change the gearing, swap the sprocket or the rear driver/cog (more teeth on the cog = easier pedaling). |
| Cranks & bottom bracket | Mid BB (BMX) | Match crank spindle to BB type. |
| Pedal thread | 9/16" × 20 | Every adult multi-piece crank uses 9/16". One-piece kids/cruiser cranks use 1/2". |
| Stems & bars | 1-1/8 steerer · 22.2 mm bar clamp | Any stem for a 1-1/8 steerer with a 22.2 mm clamp fits. You can cut a bar narrower but not wider. |
| Seatposts | ? mm | Buy posts in exactly this diameter. |
| 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) | Unknown | 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 Kink Curb 20" 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
- Kool-Stop Salmon V-brake pads, threaded post (2 pairs), $$. threaded post pads ↔ your rim brakes
- Shimano Deore cartridge V-brake pads (2 pairs), $$. threaded post pads ↔ your rim brakes
- Shimano S65T V-brake pads, threaded post (2 pairs), $. threaded post pads ↔ your rim brakes
- Kool-Stop threaded V-brake cartridge holders with salmon inserts (2 pairs), $$. threaded post pads ↔ your rim brakes
Control
- Race Face Chester composite flat pedals, $$. 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.
- Salt Pro 2-piece BMX bars 22.2, 9" rise, $$. Made for bmx bars ↔ your bmx bar
- Cult Crew BMX bars 22.2, 9.35" or 9.65" rise (heat-treated chromoly), $$$. Made for bmx bars ↔ your bmx bar
- Odyssey Broc BMX bars 22.2, 9.8" rise (multi-butted, heat-treated chromoly), $$$. Made for bmx bars ↔ your bmx bar
Utility
- USB rechargeable front + rear light set, $$. 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.
- 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, $$$. Daytime-running flash modes on both lights. ANT+ lets a Garmin or Wahoo show battery and switch them. Full power runs about 1.5 hours; medium lasts much longer.
Tires
- Odyssey Path Pro 20x2.4 BMX (pair), $$. 61 mm tire ↔ your ~61 mm clearance
- Salt Tracer 20x2.35 BMX (pair), $$. 60 mm tire ↔ your ~61 mm clearance
- Cult x Vans 20x2.4 BMX (pair), $$$. 61 mm tire ↔ your ~61 mm clearance
- Kenda Small Block Eight 20x1.75 (pair), $$. 50 mm tire ↔ your ~61 mm clearance
- Schwalbe Big Apple 20x2.0 (50-406) (pair), $$$. 50 mm tire ↔ your ~61 mm clearance
- Schwalbe Marathon Plus 20x1.75 (47-406) (pair), $$$. 47 mm tire ↔ your ~61 mm clearance
Tubes
- Slime self-sealing tubes 20 x 1.75–2.3 Schrader (pair), $$. 20" wheel size matches
- Schwalbe AV7 20 x 1.5–2.4 Schrader tubes (pair), $. 20" wheel size matches · Schrader valve ↔ your Schrader rims
Drivetrain
- KMC Z410 1/8" single-speed chain (112 links), $. 1-speed chain ↔ your 1-speed drivetrain
- KMC Z1 Wide EPT 1/8" anti-rust single-speed chain, $. 1-speed chain ↔ your 1-speed drivetrain
- KMC K710 Kool Chain 1/8" (BMX / single-speed), $$. 1-speed chain ↔ your 1-speed drivetrain
Comfort
- Odyssey Keyboard v2 flangeless BMX grips, $. Made for bmx bars ↔ your bmx bar
- ODI Longneck SLX flangeless BMX grips (160 mm), $. Made for bmx bars ↔ your bmx bar
Fits with small changes (3)
- 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).
As an Amazon Associate I earn from qualifying purchases.
Buying one used? Fair prices
Worked out from the price new ($400), 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–$300 | $185–$240 | $150–$195 |
| Good | $200–$260 | $160–$210 | $130–$170 |
| Fair | $165–$215 | $130–$175 | $105–$140 |
| Needs work | $125–$165 | $100–$135 | $80–$105 |
See what these really sold for on eBay · Other used bike prices
Geometry (size 20in)
| Head angle | 74.5° |
|---|---|
| Seat angle | 71° |
| Chainstay | 337° |
Compare with
- Hyper Bicycles Jet Fuel 20 BMX · compare frames side by side
- Mongoose Legion L20 · compare frames side by side
- Haro Downtown 20 · compare frames side by side
- Sunday Primer 20 · compare frames side by side
Sources: Kink BMX: Curb 2027 specs, geometry, price · Source BMX US: Kink Curb 2026 specs, weight, rider height · Meseroll: Kink Curb 20in BMX (2027) specs