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K. MODS RACING

Kenda Kraze 20x4.25" Supermoto Street Tire fits Super73, Macfox & Ridstar

$64.99
$64.99
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SKU: KND-KRZ-20425-1X
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PRODUCT INFORMATION

Everything You Need to Know

Product details, specifications and fitment guidance.

PRODUCT OVERVIEW

Product Description

The Ultimate Street & Wheelie Upgrade for Your 20" Fat Tire E-Bike

Ditch your loud, sluggish stock knobby tires and transform how your bike handles the pavement. The Kenda Kraze 20x4.25" Supermoto Tire is the #1 choice for street riders, commuters, and stunt builders looking for buttery-smooth carves and effortless balance point control.
Featuring a rounded street profile and a wide, continuous contact patch, the Kraze eliminates high-speed handlebar wobble and lets you lean into corners or swerve mid-wheelie without fighting aggressive side lugs.

Why E-Bike Riders Are Switching to the Kraze:

  • Wheelie & Carve Optimized: A consistent, rounded casing profile makes side-to-side transitions and one-handed combos smooth and predictable.
  • Silent, Fast Rolling: Grooved street-slick tread drastically cuts down rolling resistance—giving you higher top-end coasting speed, zero road hum, and more battery range per charge.
  • Thick Flat-Resistant Compound: Heavy-duty 30 TPI rubber casing stands up to urban glass, potholes, and hard street landings while outlasting soft stock tires.
  • All-Weather Street Grip: Deep water-channeling sipes bite into dry asphalt, boardwalks, and wet city streets for confident braking and cornering.

Pro Installation Tips:

  1. Sun-Warm Before Mounting: Because these tires have thick sidewalls and are tightly packed during transit, let your tire sit in warm sunlight for 30–60 minutes before installing so the rubber softens into shape.
  2. Even Bead Seating: Inflate to 10–15 PSI first, massage the bead evenly around the rim by hand so the sidewall line sits uniform, and then inflate to your riding pressure (never exceed 30 PSI).


The #1 cause of customer complaints on the Kenda Kraze is riders pumping the tire to 45–50 PSI with a gas station compressor trying to "pop" the bead onto wide Super73/Ridstar rims, which blows the wire bead off the rim. Putting the Max 30 PSI + Dish Soap/Hand-Seating tip in the box or confirmation email will cut refund requests to near zero.

TECHNICAL DETAILS

Specifications

  • Tire Size: 20" x 4.25" (20 x 4 1/4 | ETRTO 97-406)
  • Casing / Bead: 30 TPI Heavy-Duty Rubber | Wire Bead
  • Max Pressure: 30 PSI Max (Do not exceed 30 PSI during seating or riding)
  • Weight: ~3.15 lbs (1,430g)
  • Package Includes: 1x Kenda Kraze Tire (Select "2-Pack Set" above to outfit both front and rear wheels)
FITMENT GUIDE

Compatibility

Direct Bolt-On Compatibility (Fits Stock 20x4.0" – 20x5.0" Rims):

  • Super73: Z-Series (Z1, ZX, Z Miami), S-Series (S1, S2, S Adventure), R-Series (R, RX, R Brooklyn, R Adventure)
  • Macfox: X1, X1S, X2, X7, M20X
  • Ridstar: Q20, Q20 Lite, Q20 Pro, H20
  • Other E-Bikes: Fits P-51, Ariel Rider, Juiced, Engwe, TST, and any e-bike running 20x4.0" to 20x5.0" stock tires (compatible with 67mm to 102mm rim widths).
Not sure if it fits?

Contact us with your bike model and configuration.

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QUESTIONS ANSWERED

Frequently Asked Questions

Q. Will this tire fit my specific e-bike?

A. Yes! The Kenda Kraze 20x4.25" fits virtually all 20-inch fat tire e-bikes running standard 20x4.0" to 20x5.0" stock tires. It is a direct bolt-on fit for:

  • Super73: Z1, ZX, Z Miami, S1, S2, S Adventure, R, RX, R Brooklyn, and R Adventure
  • Macfox: X1, X1S, X2, X7, and M20X
  • Ridstar: Q20, Q20 Lite, Q20 Pro, and H20
  • Other popular models like Ariel Rider Grizzly/X-Class, Juiced, P-51, and Engwe with 20" rims.

Q. What size inner tubes should I use?

A. Use standard 20 x 4.0" or 20 x 4.25" heavy-duty inner tubes with an angled or straight Schrader valve (standard automotive-style valve). If you are running existing 20x4.0" tubes that are in good condition, they will stretch and fit into this casing without issue.

Q. What is the recommended tire pressure (PSI)?

A.

  • Maximum Pressure: 30 PSI (Never exceed 30 PSI, as over-inflation risks blowing the bead off the rim).
  • Street Carving & Commuting: 20–25 PSI provides low rolling resistance, fast coasting speeds, and great battery range.
  • Stunts & Wheelies: 15–20 PSI offers a wider, softer contact patch for enhanced balance and predictable side-to-side transitions.

Q. Does the tire come as a single or a pair?

A. Our base option is for 1 single tire. If you want to replace both your front and rear wheels, be sure to select the "Set of 2 Tires (Pair)" or the "Complete Overhaul Kit (Tires + Tubes)" from the variant dropdown before checkout.

Q. How do I install the tire properly so the bead sits evenly?

A. Because of the heavy-duty wire bead and thick rubber compound, follow these two pro tips for a painless setup:

  1. Let it warm up: Tires are bound tightly for shipping. Set the tire in warm sunlight or a warm room for 30–60 minutes before mounting to let the rubber relax into its natural round shape.
  2. Even bead seating: Mount the tire, inflate to roughly 10–15 PSI, and check that the bead line is sitting evenly along the rim edge on both sides. Massage any low spots with your hands (or apply a light swipe of soapy water along the bead), then finish pumping to your preferred riding pressure.

Q. How does this compare to stock knobby tires?

A. Unlike aggressive off-road knobbies that vibrate, hum loudly, and create rolling drag on asphalt, the Kenda Kraze features a rounded street profile with continuous center sipes. You get silent rolling, noticeably less road vibration, better battery efficiency, and significantly smoother lean angles when cornering or swerving.

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01

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02

Returns

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03

Support

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