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Firth Sports
Firth Sports AD300 Road Bike 51cm

Firth Sports AD300 Road Bike 51cm

Best price now

$899.00at Firth SportsObserved at 3:43 AM
Deal: 30% off at Firth Sports →

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Price facts

  • Lowest price today: $899.00 at Firth Sports (checked Nov 9, 2026).

Our take on the Firth Sports AD300 Road Bike 51cm

The Firth Sports AD300 is an entry-level aluminum road bike built for riders stepping up from hybrids or fitness bikes. It pairs a stiff alloy frame with a carbon fork and a drop bar setup, putting it in the same class as other budget aluminum road bikes from brands like Triban and Giant. It suits newer riders and commuters who want road geometry without a race-bike fit. The 51cm frame is aimed at riders roughly 5'6" to 5'9", so taller riders should look at larger sizes.

Best forFirst-time road bike buyersFitness riders moving to drop barsCommuting on paved roadsRiders around 5'6" to 5'9"
Pros
  • Aluminum frame with carbon fork keeps weight reasonable for the class
  • Drop bars and road geometry give a proper road position
  • 51cm size fits a wide range of average-height riders
  • Simple mechanical setup is easy to maintain and upgrade
Cons
  • Entry-level components limit shifting crispness
  • Stock tires and saddle are common upgrade targets
  • Only one size listed, so fit options are narrow
  • Alloy frame transmits more road buzz than carbon or steel

Firth Sports AD300 Road Bike 51cm prices at every store

  • Firth SportsNew

    In stock

    $899.00Observed at 3:43 AM
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Firth Sports AD300 Road Bike 51cm price history

Lowest price we've seen: $899.00 on Nov 9 at Firth Sports. Tracked across 1 store since Nov 9.

From Firth Sports

  • Full L-Twoo R7 hydraulic disc brake system for confident, consistent stopping power in any weather
  • Full L-Twoo R7 2x10-speed groupset with 20 speeds for hills and flats
  • Lightweight and durable XDSBIKE Ultra-Light Aluminum X6 frame
  • Internal cable routing for a clean, polished look
  • 700x30c Branta tires for balanced speed and stability on paved roads
  • Ergonomic alloy handlebar and comfortable Branta road padded saddle
Sizes
45cm, 48cm, 51cm, 54cm
Materials
XDSBIKE Ultra-Light Aluminum X6 frame; XDSBIKE one-body aluminum fork, thru-axle; Branta A35 alloy double wall rim 700C (35mm profile); Branta 700C x 30C black
Fit
Frame sizes 45cm, 48cm, 51cm, 54cm; 51cm recommended for riders 5'7" to 5'9"
Sizing
Size chart recommends 51cm for riders 5'7" to 5'9"; one reviewer at 5'8" with a 32" inseam found the 51cm too small after a bike fit
Shipping
Free shipping (contiguous U.S.); most orders arrive in 3–7 business days; most orders delivered via FedEx and UPS Ground within 5 days after processing
Size chart
Frame SizeRecommended Rider Height
45cm5 feet 1 inch to 5 feet
48cm5 feet 5 inch to 5 feet
51cm5 feet 7 inch to 5 feet
54cm5 feet 9 inch to 6 feet

What buyers say

Buyers like
  • Very light and agile for an aluminum bike
  • Quick and accurate gear changes
  • Great, responsive brakes
  • Stable on inclines and fast on flat pavement
  • Arrived faster than expected and in excellent condition
  • Good value for the performance
Buyers complain about
  • 51cm size chart fit too small for a 5'8" rider with 32" inseam, causing hip pain
  • Some consider the price high

Specifications

Size
AD300 // 51cm

Questions and answers

Who is the 51cm frame size for?
It generally fits riders about 5'6" to 5'9", depending on inseam and reach. Check the standover height and compare your current bike before buying.
Is the AD300 good for beginners?
Yes. The aluminum frame, carbon fork and drop bars make it a sensible first road bike. Its mechanical components are simple to service and upgrade over time.
Can it handle gravel or rough roads?
It is a road bike with limited tire clearance, so it is best on paved surfaces. Light gravel may work with narrower knobby tires, but it is not a gravel bike.
What should I upgrade first?
Most riders get the biggest gain from better tires, then a saddle that fits. Wheels and groupset upgrades cost more and make sense only once the frame fits you well.
Does it come with pedals?
Budget road bikes usually ship with basic flat pedals or none at all. Confirm with the seller and budget for clipless pedals if you plan to ride clipped in.
Where is the Firth Sports AD300 Road Bike 51cm cheapest?
At Firth Sports, for $899.00, 30% off, as of our latest check.
What do buyers say about the Firth Sports AD300 Road Bike 51cm?
Buyers like: Very light and agile for an aluminum bike; Quick and accurate gear changes; Great, responsive brakes. Common complaints: 51cm size chart fit too small for a 5'8" rider with 32" inseam, causing hip pain; Some consider the price high.

Stores we've priced the Firth Sports AD300 Road Bike 51cm at

  • Firth Sports deals and prices