Blue Sky 20

On Sale!

This bike is considered best in class and is custom-built just for you from the frame up in Fort Collins, Colorado. Due to the overwhelming order volume, please expect a shipping date of approximately 5-7 business days from your order date. Quality takes a little bit of time and these bikes are worth the wait so please plan ahead for birthdays, vacations and riding camps.

(3 customer reviews)


Have us set up your bike tubeless with color matched tubeless valves and Orange Seal tire sealant!

Dropper Post Install – Have a KS LEV Si 75mm dropper post pre-installed on your complete bike. Special price this month!!!

REALLY like pink? Upgrade your pedals, lock-on grip ends and chainring to PINK anodized! Super limited time only!

Upgrade your pedals, lock-on grip ends and chainring to BLUE anodized! Super limited time only!

Upgrade your pedals, lock-on grip ends and chainring to GREEN anodized! Super limited time only, the level of customization really doesn’t get better than this!

SKU: BS20 Category: Tag:



Bike Weight Truly Matters

Turquoise and LAVA out of stock, returning on September 15. Please contact us to get on our backorder list.

Introducing the Blue Sky 20, where bike weight truly matters! Crafted meticulously in small batches, each frame features double-butted 7005 aluminum tubing for optimal strength and weight efficiency. With super-clean internal cable routing, forged dropouts, and post-mount disc brake mounts both front and rear, the Blue Sky 20 ensures a smooth and controlled ride. Starting in the low 19-pound range with the Pro Deore model, our focus on high-quality component selection ensures exceptional performance. Noteworthy details include our new lightweight 127mm Trailcraft aluminum spindle direct mount cranks, offering your choice of 28 or 30-tooth narrow-wide style chainring to minimize weight without compromising strength.

The Blue Sky 20 Pro model elevates performance with our Stans Crest MK4 Custom 1050-gram wheelset. Expertly laced hubs, lightweight rims, and Ashima 85-gram 160mm rotors provide optimal stopping power while maintaining a super-lightweight profile. Often overlooked, rotor selection plays a crucial role in reducing rotational weight, enhancing the riding experience for both beginners and seasoned riders alike.

For enhanced control and comfort, our TC30 air-sprung suspension 80mm fork stands as the lightest 20" fork available. Combined with BIG tubeless tires, it smooths out rough terrain, allowing for longer, more enjoyable rides with your young rider.


Customizable Component Selection: Tailored to Your Preferences

Our commitment to customizable options extends to component selection. The Pro model 1x10 group features Shimano Deore brakes, a Shimano Deore shifter, and a Shimano Zee rear derailleur, ensuring low weight and high performance. Alternatively, the Special Build Level 1x10 components offer Microshift 9-speed components and Shimano MT-201 hydraulic disc brakes, balancing weight, performance, and budget.


The Ultimate Goal: The Lightest Production 20” Trail Bike

The ultimate goal? To build the lightest production 20” trail bike, requiring no further modifications. Designed and built in Colorado, the Blue Sky 20 boasts super-light components, including our TC30 carbon fiber suspension fork and alloy spindle direct mount crankset. Choose your preferred chainring size based on your terrain, and enjoy the convenience of water bottle compatibility, a rarity in this category.


Versatile Performance: Ready for Any Adventure

Whether racing, hitting the trails, or exploring parks, the Blue Sky 20 delivers next-level performance and versatility. Built with premium components and meticulous attention to detail, it's not just another heavy 20" kids bike—it's a machine designed to keep up with your child's adventurous spirit. Assembled in Fort Collins, Colorado, each bike is tailored to your preferences, offering three color options, two build levels, and two chainring size options. Rims come pre-taped and tubeless-ready, providing an option to shed an additional 250 grams for an even lighter ride from the start.


The bike on this page is our PRO model, the absolute lightest 20" bike you can buy in the category at just about 18.5 pounds. For a more budget-friendly model (with a small weight penalty), check out our Blue Sky 20 LTD ready to ride bike.



Chainring Selection Options

  • 28 Tooth - For easiest climbing in mountainous areas.
  • 30 Tooth - Better for some hills and more flat terrain.


Other Features

  • Lightweight 127mm Trailcraft aluminum spindle direct mount cranks.
  • Includes Stans Crest MK4 Custom 1050-gram wheelset.
  • TC30 Air-Sprung Suspension 80mm Fork.
  • Ashima 85-gram 160mm rotors.


Water Bottle Compatibility


Note: Silver decals are on the 2024 Stans Crest MK4 wheelset, not frame color-matched decals.



MODELSpecial Build
Pro Build
FRAMEBlue Sky 20 7005 Series Aluminum
Blue Sky 20 7005 Series Aluminum
FORKTrailcraft TC30 1425 grams, carbon lowersTrailcraft TC30 1425 grams, carbon lowers
HEADSETTrailcraft Precision Sealed Cartridge
Trailcraft Precision Sealed Cartridge
Shimano Zee 10 speedShimano Saint 10 speed
SHIFTERShimano Deore 10 speed
Shimano Deore 4100 10 speed
BRAKESShimano MT201 HydraulicShimano Deore 6100 Hydraulic
CRANKSTrailcraft Direct Mount 127mm, 28 or 30t optionTrailcraft Direct Mount 127mm, 28 or 30t option
Trailcraft Alloy
Trailcraft Alloy superlight
GRIPSTrailcraft Lock-On
Trailcraft Lock-On
STEMTrailcraft, Length: 40mm
Trailcraft Superlight 70 grams, Length: 40mm
POSTTrailcraft 30.9
Trailcraft Superlight 130 grams, 30.9
PEDALSWelgo M21 Aluminum VP Composite with metal pins
CASSETTESunrace 11-36Sunrace 11-36
WHEELSETTrailcraft 20", 1350 grams alloy hubs
Stans Crest MK4 20", Chosen Superlight alloy hubs 1050 grams
TIRESKenda Booster 2.2" 400 grams
"Kenda Booster 2.2"" 400 grams

Estimated Weight20.2 pounds tubeless18.75 pounds tubeless

*COVID parts availability advisory: The bike industry is currently having trouble keeping up with demand in these strange times. Standard builds purchased from the website might include unavailable parts at which point we will replace them with equivalent parts (and upgraded parts in some cases) due to supplier availability. Please reach out to us directly if you have any questions or would like to ensure your build includes any specific parts.

Reviews (3)

3 reviews for Blue Sky 20

  1. johng-9538

    If you want the very best kids’ 20” bike on the market, this is it! We bought the Blue Sky 20 in the Pro Build and couldn’t be happier. The components, geometry, weight, color selection and ability to customize options make this bike stand alone in the industry. Combine that with the outstanding, family-run operation and custom, customer service with Brett and Ginger that help with all details along the way, and you have a seamless process to give your kid their next dream bike… and the bike you always wish you had at this age. It climbs, shifts and brakes like no other and you’ll find it hard to get your kiddo to stop riding. Our family loves to bike and think the purchase was well worth it. We ride hours vs. minutes now and the overall quality keeps you riding and looking for the next series of trails to explore. You will not be disappointed!

  2. Kevin Purvis (verified owner)

    Got my daughter on a Specialized Riprock 20″ (7 speed, disc brakes), on her 5th birthday. It was OK, but she was trying to keep up with 6 & 7 year olds and burning out quickly. I broke down and got the Blue Sky 20″ four months later. Fantastic change, top reason I bought it was the weight and there was an immediate improvement on her climbs and overall riding endurance. The weight also made the bike more nimble and maneuverable for her. Lastly she benefited from the additional gear range. This is the best bike out there for the size.

  3. Mike Campian

    This bike is perfect for the kid who wants to go out and slay some dirt. Weight and geometry is exceptional for the young rider perfecting their craft. It is completely worth the price tag. It will not disappoint. Thanks Trailcraft!

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Additional information

Additional information


Pro Build, Special Build


Blue, Hot Pink, Lava, Neon Green, Turquoise

Chainring Size

28T, 30T



Geometry - Blue Sky 20(millimeters)
Seat Tube Length-Center to Top270
Top Tube Length (Horizontal)445
Top Tube Length (Actual)443
Chainstay Length340
Bottom Bracket Heightxxx
Seat Tube Angle (Actual)73 Degrees
Head Tube Angle68 Degrees
Wheel Base864
Standover Height508mm or 20 inches

Size Chart

Size Chart

Approximate Age5-8
Minimum Inseam21 inches
Height Range3'9"- 4'2"


Customer Rides