HASA RTS1 2x9 speed Kids 700c Road Bike
$4,290.00
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The HASA RTS1 is a 700c kids' road bike that uses the same 700c wheel size as adult road bikes, with a 6061 aluminium frame, SENSAH 2x9-speed gearing, short 152 mm cranks and a narrow 360 mm drop bar. Jollymap recommends it for children from about 130 cm tall who are ready for a proper road bike or a first triathlon.
At a glance
- Category: kids' / youth 700c road bike, aluminium frame, caliper brakes
- Brand: HASA (Heng Feng Bicycle, Taiwan), RTS1 (listed on HASA's website as the 2026 RTS neo)
- Frame and fork: 6061 aluminium frame, 700C alloy fork, 40 cm frame size (listed by Jollymap as XXS)
- Kid-sized parts: 152 mm cranks, 360 mm wide drop bar, 46/34T chainrings with 11-32T cassette
- Weight: approx. 9.6 kg without pedals (Jollymap figure)
- Rider height: from about 130 cm (Jollymap recommendation; HASA does not publish a height range)
- Best for: confident young riders who want to join road rides or triathlons
Why a 700c kids' road bike?
It is hard to find a road bike that fits children of about 130 to 150 cm. There are few 24-inch kids' road bikes, some are heavy, and parts can be hard to find. The RTS1 shrinks the frame but keeps the 700c wheel size used on adult road bikes, so the wheels hold speed well, and tyres, tubes and wheels in 700c size can be used for servicing or upgrades.
Although it is an entry-level road bike, the parts are chosen for children:
- 360 mm narrow drop bar: matches a child's narrower shoulders.
- 152 mm short cranks: the knees do not have to rise as high at the top of the pedal stroke, so pedalling feels more natural.
- 2x9-speed drivetrain (46/34T x 11-32T): lighter gearing for climbs.
- SENSAH shifters: extra-short reach for small hands; the shifting works like SRAM (Jollymap's original description).
Jollymap data: saddle to pedal about 62 cm, weight about 9.6 kg without pedals.
Who is it for?
- Children from about 130 cm who already ride confidently and can control their brakes.
- Kids heading into triathlons, road training or longer family rides.
- Parents who ride road bikes and want to reuse 700c parts for upgrades.
Less suited to: children under 130 cm, those still learning to ride, or mostly park riding. Shorter riders can look at 24-inch kids' road bikes such as the Solar 24 inch Racing Pro 24 Alloy 18 Speed Kids Road Bike or the Oyama JR 24 inch Kid Road Bike; for 26-inch there is the Frog Road 70 Super Lightweight Alloy 26 inch Kids Bike. Pair it with a proper helmet such as the MET IDOLO MIPS Road Cycling Helmet.
How to choose a HASA road bike
The RTS1 is the HASA road bike designed for children. The table below lists the HASA road bikes in the Jollymap shop:
| Model | Frame | Groupset | Wheelset | Brakes | Weight (approx.) | Best for |
|---|---|---|---|---|---|---|
| Hasa Cometa 105 Di2 Road Bike with Carbon Wheelset | T800/T1000 carbon, full carbon fork | 2 × 12-speed electronic (Shimano 105 Di2, 50/34T, 11–36T) | Crociera CS45 carbon | Shimano 105 hydraulic disc | — | Riders who want an aero frame with fully internal routing and 105 Di2 electronic shifting |
| Hasa Cometa Ultegra Di2 Road Bike with Carbon Wheelset | T800/T1000 carbon, full carbon fork | 2 × 12-speed electronic (Shimano Ultegra Di2, 50/34T, 11–36T) | Carbon (please confirm model before ordering) | Shimano Ultegra hydraulic disc | — | Experienced riders who want an aero frame with fully internal routing and the Ultegra Di2 groupset |
| HASA Deroma 2025 105 DI2 Road Bike with Carbon Wheelset | T1100 carbon, full carbon fork | 2 × 12-speed electronic (Shimano 105 Di2, 50/34T, 11–36T) | Boreas Stella Eterna 45 carbon | Shimano 105 disc | 7.3 kg ± 0.15 kg (size M, HASA official) | Weight-conscious riders who want a T1100 carbon frame with 105 Di2 |
| HASA Deroma 2025 Ultegra DI2 Road Bike with Carbon Wheelset | T1100 carbon, full carbon fork | 2 × 12-speed electronic (Shimano Ultegra Di2, 50/34T, 11–36T) | Boreas Stella Eterna 45 carbon | Shimano Ultegra disc | 7.2 kg ± 0.15 kg (size M, HASA official) | Weight-conscious riders who want a T1100 carbon frame with Ultegra Di2 |
| HASA CORAGGIO 2025 105 Road Bike | T800 carbon, full carbon fork | 2 × 12-speed mechanical (Shimano 105, 50/34T, 11–36T) | Boreas Alloy A28D aluminium | Shimano 105 hydraulic disc | 8.94 kg (HASA official) | Riders starting out on a carbon frame with 105 mechanical shifting and alloy wheels |
| HASA CORAGGIO 2025 105 Road Bike with Carbon Wheelset | T800 carbon, full carbon fork | 2 × 12-speed mechanical (Shimano 105, 50/34T, 11–36T) | Crociera CS45 carbon | Shimano 105 hydraulic disc | 8.83 kg (HASA official) | Riders who want to keep mechanical shifting but upgrade to carbon wheels first |
| HASA CORAGGIO 2025 105 Di2 Road Bike | T800 carbon, full carbon fork | 2 × 12-speed electronic (Shimano 105 Di2, 50/34T, 11–36T) | Boreas Alloy A28D aluminium | Shimano 105 hydraulic disc | 8.93 kg (HASA official) | Riders who want 105 Di2 electronic shifting with alloy wheels |
| HASA CORAGGIO 2025 105 Di2 Road Bike with Carbon Wheelset | T800 carbon, full carbon fork | 2 × 12-speed electronic (Shimano 105 Di2, 50/34T, 11–36T) | Crociera CS45 carbon | Shimano 105 hydraulic disc | 8.7 kg (HASA official) | Riders who want both 105 Di2 electronic shifting and carbon wheels |
| HASA RSX Frameset | T800 carbon, full carbon fork | Frameset only, no groupset | Not included | Not included | 2.8 kg (HASA official frameset figure) | Riders who want to choose their own groupset and wheels and build the bike their way |
| HASA RTS1 2x9 speed Kids 700c Road Bike (this page) | 6061 aluminium alloy, alloy fork | 2 × 9-speed mechanical (SENSAH, 46/34T, 152 mm cranks, 11–32T) | 700c double-wall rims, 32H | Tektro R-315 calipers | 9.6 kg (Jollymap product info, without pedals) | Kids about 130 cm tall and up (Jollymap recommendation) who want to try road cycling or enter a triathlon |
Size and geometry
The RTS1 comes in one size (40 cm per HASA, listed by Jollymap as XXS). HASA does not publish a rider height range; Jollymap recommends it from about 130 cm, and our original description targets children of about 130 to 150 cm. HASA's official geometry:
| Seat tube length | 400 mm |
| Seat tube angle | 74.5° |
| Top tube length | 499.1 mm |
| Head tube length | 95 mm |
| Head tube angle | 69° |
| Fork length | 395 mm |
| Wheelbase | 978.9 mm |
| Chainstay length | 410 mm |
| BB drop | 70 mm |
| Reach | 375.2 mm |
| Stack | 511.7 mm |
Is your child close to 130 cm, or already over 150 cm? Chat with us before ordering with their height and inseam, and we will advise from the geometry.
Full specifications
| Brand | HASA (Heng Feng Bicycle, Taiwan) |
| Model | RTS1 (listed on HASA's website as the 2026 RTS neo) |
| Frame | 6061 aluminium |
| Fork | 700C alloy |
| Headset | 1-1/8" |
| Bottom bracket | FSA BB-7420ST |
| Shifters | SENSAH, 2x9-speed |
| Front / rear derailleur | SENSAH |
| Crankset | 46/34T, 152 mm cranks (HASA lists SENSAH; Jollymap's original spec says Prowheel) |
| Cassette | SUGEK 11-32T |
| Chain | YBN S9 |
| Wheels | 700C double-wall alloy rims, 32 holes (Jollymap's original spec says Boreas) |
| Hubs | JOYTECH alloy, 32 holes |
| Spokes | Stainless, black ED |
| Tyres | 700x25C |
| Handlebar | Alloy drop bar, 360 mm wide (width per Jollymap) |
| Stem / seatpost / seat clamp | Alloy, sand black |
| Saddle | SAGA, steel rails |
| Brakes | Tektro R-315 caliper brakes |
| Brake levers | SENSAH |
| Weight | Approx. 9.6 kg without pedals (Jollymap figure) |
| Saddle to pedal | Approx. 62 cm (Jollymap data) |
| Size | 40 cm (listed by Jollymap as XXS) |
| Colours (Jollymap) | Glossy White, Matt Black |
Spec source: HASA official 2026 RTS neo product page (model RTS1) and Jollymap's spec sheet; bar width, weight and saddle-to-pedal height are Jollymap figures. HASA reserves the right to change specifications; the actual product prevails.
About HASA
HASA is the in-house brand of Heng Feng Bicycle in Taiwan. According to HASA's website, Heng Feng was founded in 1990, is based in Kaohsiung, and develops and manufactures titanium, carbon and aluminium frames as well as complete bikes. HASA is less well known in Hong Kong than the big brands, but its exhibition record shows years of appearances at international shows such as Taipei Cycle and Eurobike.
Jollymap's advice
The RTS1 suits children who already have good bike-handling skills and want to take the next step. Measure your child's height and inseam first, and make sure they can control the caliper brakes from the drop bar. If you want to adjust the spec to your child's level, or are unsure about fit, chat with us before ordering, or message our Facebook page.
FAQ
How tall should a child be for the HASA RTS1?
Jollymap recommends about 130 cm and up. HASA does not publish a height range; our original description targets children of about 130 to 150 cm, and we measured about 62 cm from saddle to pedal. If your child is close to 130 cm or over 150 cm, please contact us before ordering so we can check height and inseam.
How much does the HASA RTS1 weigh?
About 9.6 kg without pedals (Jollymap figure). HASA's spec page does not list a weight.
What is the difference between a 700c and a 24-inch kids' road bike?
Mainly wheel size and rider height. The RTS1 uses the same 700c wheel size as adult road bikes, so 700c tyres, tubes and wheels fit, which makes servicing and upgrades easier; Jollymap recommends it from about 130 cm. Shorter children can look at 24-inch kids' road bikes such as the Solar 24 inch Racing Pro 24 Alloy or the Oyama JR 24 inch Kid Road Bike.
What gears does the HASA RTS1 have?
SENSAH 2x9-speed, 18 gears in total: 46/34T chainrings, a SUGEK 11-32T cassette and 152 mm cranks (HASA official spec). Jollymap's original description notes the SENSAH levers have an extra-short reach and shift like SRAM, which differs from Shimano.
What is the difference between the HASA RTS1 and RTS1D?
They are listed on separate pages of HASA's website. The RTS1 on this page matches HASA's "2026 RTS neo": Tektro R-315 caliper brakes, SENSAH 46-34T chainrings, a SUGEK 11-32T cassette and an FSA BB-7420ST bottom bracket. HASA's "2026 RTS1D" page lists SENSAH brakes, SHUN 46-33T chainrings, a Shimano 11-36T cassette and a NECO B910 bottom bracket, in blue, black and white. Both use a 6061 aluminium frame in a 40 cm size with 700C wheels.
What brakes does the HASA RTS1 use?
Tektro R-315 caliper brakes with SENSAH brake levers (HASA official spec).
What colours does the HASA RTS1 come in?
The Jollymap shop lists Glossy White and Matt Black. HASA's official page lists red, blue, black and white.
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Specifications and components follow the manufacturer's latest release and may change without notice. If in doubt, please contact us to confirm before ordering.
Last updated: October 2026
