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- USA
- CAN
Ships within 48 hours · Estimated delivery Aug 4 - Aug 9
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Description
kinderfahrrad sirene GT Siren 20Overview Even our kids bikes are built right from the ground up perfectly proportioned lightweight alloy frame, easy riding low slung design, and handling that makes every ride a breeze. Durable 1pc cranks, all terrain tyres, 2pc bars and even a numberplate FTW. Improved Geometry bikes with the LegitFit system feature geometry adjustments to improve ergonomics for youth statures. The result: Increased stability, comfort and confidence for a wider
Overview
Even our kids’ bikes are built right from the ground up – perfectly proportioned lightweight alloy frame, easy-riding low-slung design, and handling that makes every ride a breeze. Durable 1pc cranks, all-terrain tyres, 2pc bars and even a numberplate FTW.
- Improved Geometry bikes with the LegitFit system feature geometry adjustments to improve ergonomics for youth statures. The result: Increased stability, comfort and confidence for a wider range of riders.
- Easier Pedaling bikes with the LegitFit system have their pedal positions moved slightly forward. The result: Makes it easier to pedal.
- Better Positioning bikes with the LegitFit system have narrower crank and pedal positions that match the width of a child’s hips. The result: A stronger, more natural pedal stroke.
Specs
| Sizes | One Size |
|---|---|
| Model Code | G52301F |
| Frame | 20" GT LegitFit Design, Alloy |
| Fork | GT Hi-Ten Steel, 1" Threaded Steerer |
| Chain | KMC S1, 1/2x1/8" |
| Crank | Forged One-Piece Type, 127mm, 32T |
| Bottom Bracket | Steel, Ball Type |
| Pedals | Jr. BMX Design, Resin |
| Cog Set | Null |
| Rims | Alloy, 28h |
| Tires | GT 20 x 1.95" |
| Front Hub | Steel, nutted axle |
| Rear Hub | Steel, Nutted Axle, Coaster Brake |
| Spokes | Stainless Steel, 14g |
| Brakes | Coaster Rear, Rear Alloy VBrake |
| Front Brake | Coaster Rear, Rear Alloy VBrake |
| Rear Brake | Coaster Rear, Rear Alloy VBrake |
| Brake Levers | Alloy V-type |
| Handlebar | Steel Riser Bar, 176mm Rise, 580mm Width |
| Stem | 2-Bolt Alloy Top, Steel Quill |
| Grips | 120mm Closed End |
| Headset | 1" Threaded, Steel |
| Saddle | GT 1-piece |
| Spec Extras | Fender, Bar, Stem Pad |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.6 ★★★★★
Based on 13 reviews
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Product Reviews
★★★★★ 5
Dog loved it
Size: One-Size-for-Most
Great! My dog loves taking it outside at night so he can see where it goes easier. Super bouncy, he has had it for over a year now and still not destroyed. Perfect size for his mouth too and easy to clean.
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Reviewed in the United States on February 12, 2026
★★★★★ 5
Light up and glow in the dark ball
Size: One-Size-for-Most
Definitely my girls favorite ball 😀. It disappears and I have to buy another one or she goes nuts. Glows in the dark, brighter with more sun. The bounce light up don’t last a real long time, too quick to quit for her but still loves it.
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Reviewed in the United States on May 13, 2026
★★★★★ 5
Durable & Bright - Great for Heavy Chewers
Size: One-Size-for-Most
Pros:
Extremely Durable: Survived an aggressive chewer where tennis balls failed.
Dual-Visibility: Features both internal flashing lights and a glow-in-the-dark "chargeable" surface.
Perfect Size: Fits comfortably in the mouth of a 40lb medium-sized dog. Same size as a tennis ball.
Cons:
Battery Life: Unsure how long the internal flashing lights will last (though it has held up well so far).
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Reviewed in the United States on February 8, 2026
★★★★★ 5
Great for night time play!
Size: One-Size-for-Most
This ball is great! It is a 2-for-one light up feature so we love the flashing lights and if she drops it in the snow after those lights stop, we can still find it because of the strong glow that gets its charge from the flashing LED lights. Our first one lasted a few years, we lost it on a trip so now back for our second one so we can keep the night time fetch going! She is a golden retriever for size reference. Any bigger of a breed and I would worry it might be too small for her mouth. It’s a bit smaller than a tennis ball. Just don’t make the same mistake I did and let them have it in the house at night, she walked up to my bedside while I was asleep one night and squeezed it to activate it. Those lights are so bright it was a rude awakening!
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Reviewed in the United States on November 11, 2025
★★★★★ 4
Good option for playing at night
Size: One-Size-for-Most
This ball is a good option if your dog likes to fetch at night. It stays lit for about 20 minutes or so, but that is me only leaving it out of the counter, being "charged" by whatever house lights are on. My dog isn't a big chewer, but it seems as though it would hold up well. I like that it is easy to rinse and clean. It seems to be a good value.
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Reviewed in the United States on January 16, 2026