RoyalBaby Bike Size Chart
Size chart and fit guide for 2026
RoyalBaby focuses exclusively on kids and youth bicycles, sized strictly by wheel diameter (12", 14", 16", 18", 20", 24", 26") with matching height ranges per model. The lineup spans first-pedal bikes (Freestyle, Stargirl, Dual Handbrake), 2-in-1 balance-to-pedal convertibles (EZ, Terra), magnesium-alloy lightweight frames, and an aluminum mountain bike for older kids. Frames typically include adjustable seats and bars to extend the usable height range as the child grows.
RoyalBaby Size Charts by Category
RoyalBaby Kids Bike Size Chart
| Size | Height Range | Inseam Range |
|---|---|---|
| 12" | 2'9" - 3'5"(85 - 105 cm) | 13.8" - 17.3"(35 - 44 cm) |
| 14" | 3'1" - 3'9"(95 - 115 cm) | 15.7" - 19.7"(40 - 50 cm) |
| 16" | 3'5" - 4'1"(105 - 125 cm) | 18.1" - 22.0"(46 - 56 cm) |
| 18" | 3'9" - 4'5"(115 - 135 cm) | 20.1" - 24.0"(51 - 61 cm) |
| 20" | 4'0" - 4'9"(122 - 145 cm) | 21.7" - 26.4"(55 - 67 cm) |
| 24" | 4'5" - 5'3"(135 - 160 cm) | 24.4" - 29.5"(62 - 75 cm) |
| 26" | 4'11" - 5'9"(150 - 175 cm) | 27.6" - 33.1"(70 - 84 cm) |
RoyalBaby Mountain Bike Size Chart
| Size | Height Range | Inseam Range |
|---|---|---|
| 20" (Youth) | 4'0" - 4'8"(122 - 142 cm) | 21.7" - 26.4"(55 - 67 cm) |
| 24" (Youth) | 4'5" - 5'3"(135 - 160 cm) | 24.4" - 29.5"(62 - 75 cm) |
| 26" (Teen / Petite Adult) | 4'11" - 5'9"(150 - 175 cm) | 27.6" - 33.1"(70 - 84 cm) |
Popular RoyalBaby Models & Sizing Notes
Specific sizing recommendations for RoyalBaby's most popular bike models. Geometry measurements shown for reference size (typically M or 54cm).
RoyalBaby Stargirl 12
🧒 Kids Bike • 202512-inch first bike for girls ages 3-5 (height ~85-105 cm / 33-41"). Lowered step-through frame, training wheels, hand + coaster brakes, basket and bell included. Sparkly Stargirl decals.
RoyalBaby Stargirl 14
🧒 Kids Bike • 202514-inch step-through girls bike for ages 3-5 (height ~95-115 cm). Hand + coaster brakes, training wheels, sparkle Stargirl theme with handlebar bell. Adjustable seat extends usable years to age 13.
RoyalBaby Freestyle Classic
🧒 Kids Bike • 2025BMX-styled kids bike sold in 12", 14", 16" and 18" wheel sizes for ages 3-10. Sealed-bearing patent crank, training wheels, coaster brakes, water-bottle holder and adjustable seat / bars.
RoyalBaby Dual Handbrake Kids Bike
🧒 Kids Bike • 2025Kids bike with dual hand brakes (no coaster) in 12", 14", 16", 18" and 20" wheels for ages 3-10. Short-reach grips for small hands, 2.4" wide tires, training wheels on 12-16".
RoyalBaby Magnesium Alloy Lightweight
🧒 Kids Bike • 2025Lightweight magnesium-alloy kids bike in 14", 16" and 18" wheels (roughly ages 3-9). Lighter than equivalent steel bikes for easier handling. Hand + coaster brakes, adjustable seat.
RoyalBaby EZ Balance to Pedal 2-in-1
🧒 Kids Bike • 20252-in-1 convertible: starts as a balance bike (no pedals) and converts to a pedal bike when the child is ready. Sold in 12", 14", 16", 18" and 20" wheels - pick by current height + balance-bike phase first.
RoyalBaby Terra EZ Balance to Pedal
🧒 Kids Bike • 2025Convertible balance-to-pedal kids bike (Terra series) in 14", 16" and 18" wheels. Easy-learn design starts pedal-free; pedals attach when the child has learned balance. Adjustable seat.
RoyalBaby Ultra-Light Aluminum Mountain Bike
🚵 Mountain Bike • 2025Youth / petite-adult aluminum hardtail in 20", 24" and 26" wheels - fits kids and teens roughly 4'0"-5'9" tall. Lightweight 6061 aluminum frame, multi-speed drivetrain, mechanical disc or V-brakes depending on size.
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RoyalBaby Sizing Tips
How to Measure
- • Height: Stand barefoot against a wall and measure from floor to top of head
- • Inseam: Stand barefoot with feet 6 inches apart, press a level book firmly upward, and measure from the floor to its top edge
- • Arm Reach: For road bikes, measure from shoulder to fingertips
When Between Sizes
- • Comfort priority: Choose the larger size
- • Performance priority: Choose the smaller size
- • Long torso: Size up for better reach
- • Long legs: Size down for better standover
RoyalBaby Sizing FAQ
Accessories for RoyalBaby bikes
Helmets, saddles, lights and locks that fit any RoyalBaby build.
Bell
Bell Nomad 2 MIPS
This ASIN is Small/Medium 52-57 cm. Check the selected Amazon size/color before checkout.
Avasta
AVASTA Kids Bicycle Saddle
Standard saddle rail spacing fits most kids' seatpost clamps. Designed primarily for 12-20" wheel kids' bikes; larger riders may prefer a wider adult saddle.
Bell
Bell Lumina 300 Headlight
Tool-free handlebar mount; check bar space around computers, bells, and baskets.
Abus
ABUS Granit X-Plus 540
Inner dimensions: 5.5" x 8" (14 x 20cm). Premium size for frame + wheel security. Heavy-duty for high-theft areas.
Bivo
Bivo Duo 25 oz Stainless Bottle
Fits most major cages, but the 77 mm maximum diameter is a touch larger than a standard plastic bottle. Check tight side-load cages on very small frames.
Giro
Giro Register MIPS
S 51-55 cm, M 55-59 cm, L 59-63 cm
RoyalBaby Comparisons & Guides
Find Your RoyalBaby Size
Use our free calculators and guides to determine your ideal RoyalBaby frame size.
Road Bike Calculator
Calculate your RoyalBaby road bike size
Mountain Bike Calculator
Find your ideal MTB frame size
General Calculator
Universal bike sizing tool
Best next guides
Where to go from your RoyalBaby sizing
Turn your measurements into a confident buy.