FRP Moto FX140 vs SSR 140 vs Apollo 140: Best 140cc Pit Bike (2026)

How do the FX140, SSR 140, Apollo 140 and Coolster specs compare?

All five bikes in the table are single-cylinder four-strokes with a manual clutch, so engine size is not what separates them. Start type, rider limit, wheel size, warranty and how you buy them do.

SSR figures from the ssrmotorsports.com SR140TR, SR140R and SR140RB pages. Apollo figures from the apolloatv.com Thunder 140 page. Coolster figures from the coolster.com M-125 and QG-214FC pages. All checked October 13, 2026. FX140 figures from the FRP product page, checked the same day. FRP lists net weight, Coolster lists gross weight, and SSR and Apollo do not say which they use. Prices exclude tax, destination and dealer fees and can change.

Which bikes are the SSR 140, Apollo 140 and Coolster 140?

SSR. SSR still hosts a spec page for the SR140TR, the model most comparisons name, but its current pit bike menu lists the SR140R (2025) and the SR140RB (2026) instead. The three share a 140cc air/oil-cooled YX engine and a 4-speed. The SR140TR is kick only on 14/12 wheels. The SR140R adds electric start on 14/12 wheels with a 30.9 in seat, 161 lb and a $2,149 MSRP. The SR140RB adds electric start on 17/14 wheels with a 33.8 in seat, 178 lb and a $2,249 MSRP, which makes it the SSR closest in size to the FX140.

Apollo. "RFZ 140" and "DB-X 140" show up on dealer listings, but apolloatv.com, Apollo's US distributor site, has no page for either. The 140cc dirt bike it does publish is the Thunder 140, so that is the Apollo used here. Apollo recommends it for ages 13 to 18 and sells it through dealers on a quote.

Coolster. Coolster's dirt bike line on coolster.com runs 50cc, 70cc, 110cc and 125cc. A site search for 140 finds a spare swingarm part and no bike. The table uses the M-125 because it is Coolster's 17/14-wheel model, the same wheel sizes as the FX140. Coolster's QG-214FC, a 14/12 bike, lists a 120cc air-cooled engine in its spec tab and about 55 mph in its description. If a seller offers a "Coolster 140", ask for the engine size and spec sheet in writing.

How fast is a 140cc pit bike?

FRP lists the FX140 at about 65 mph. Apollo lists the Thunder 140 at 50 mph. SSR does not publish a top speed for any of its 140s, but it does publish 12 hp at 8,500 rpm for the SR140TR, against 11.0 hp at 7,500 rpm for the FX140. Coolster lists 30 mph for the M-125 in its description.

These are the makers' own figures, not a side-by-side test, and gearing, rider weight and ground change the real number. What the figures do tell you is which makers are willing to put a number in writing.

Which 140cc pit bike holds the most weight?

Of the published figures, the FX140's 265 lb maximum load is the highest. Apollo rates the Thunder 140 to 165 lb. SSR and Coolster do not publish a rider limit for these models.

Seat height is the other fit guide. The FX140 (33.9 in), SR140RB (33.8 in) and Thunder 140 (33 in) are built for taller teens and adults. The SR140TR (32 in) and SR140R (30.9 in) sit lower on 14/12 wheels. For a shorter rider, the FX125 comes in a 14/12 build with a 28.1 in seat.

Which 140cc pit bikes have electric start and oil cooling?

Electric start. The FX140 has electric start with a kick starter as backup. SSR's SR140R and SR140RB list kick and electric start. The SR140TR, the Apollo Thunder 140 and the Coolster M-125 are kick only.

Cooling. FRP lists the FX140 as oil-cooled. SSR lists its YX engines as air/oil-cooled, and Apollo lists the Thunder 140 as air-cooled. So the FX140 and the SSRs are closer on cooling than the FX140 and the Apollo. FRP's argument for oil cooling is that it keeps power up on long climbs, hot days and hour-long sessions, where an air-cooled engine starts to fade.

Who should buy each 140cc pit bike?

SSR SR140TR, SR140R or SR140RB

Choose an SSR if you want a dealer to set up and service the bike, and you want adjustable suspension. SSR publishes the most suspension detail here: an inverted fork with rebound and compression adjustment and a 290 mm shock with preload and rebound adjustment on the SR140TR, and an adjustable inverted fork and mono shock on the SR140R and SR140RB. The SR140TR also has the lowest listed weight in the table, 157 lb. The trade-offs are a $1,959 to $2,249 MSRP before destination and dealer fees, a 30-day parts-only warranty, and no published top speed or rider limit.

Apollo Thunder 140

Choose the Thunder 140 if a dealer near you stocks it and the rider is within Apollo's 165 lb maximum load. It has hydraulic discs, 17/14 wheels, a 33 in seat and 12.8 in of ground clearance. The trade-offs are kick start only, an air-cooled engine, a 3-month warranty and no published power figure.

FRP Moto FX140

Choose the FX140 if the rider weighs more than 165 lb (it is rated to 265 lb), you want electric start on 17/14 wheels, and you want a 1-year limited warranty. It is $1,149.99 plus $399.99 shipping, sold direct, and you assemble it yourself.

Where does the FX140 give ground?

• Four gears. The SSR and Apollo 140s are four-speeds too, but Kawasaki's dealer-sold KLX140R has five. None of the bikes on this page has a fifth gear.
• No dealer network. FRP sells direct. There is no local shop to set the bike up, handle warranty work or sell you a part over the counter; support and parts come from FRP and ship to you. SSR, Apollo and Coolster all sell through dealers.
• Crate freight and self-assembly. The FX140 ships in a crate by LTL freight with curbside delivery. The carrier calls to book a time, and you will want help getting the crate off the curb. You assemble the bike yourself: FRP puts it at 30 to 45 minutes with the included tools, and one verified owner had to reconnect a loose wire and adjust the clutch cable before it shifted properly (his review is below).
• No California sales. FRP does not sell or ship the FX140 to California. It is EPA off-road only.
• Less published chassis detail. FRP lists long-travel suspension but no travel, adjustment or ground clearance figures. SSR publishes fork and shock adjustment, and SSR and Apollo both publish ground clearance.
• Not the lightest. At 170.9 lb, the FX140 is heavier than SSR's SR140TR (157 lb) and SR140R (161 lb), and lighter than the Thunder 140 (174 lb) and SR140RB (178 lb).

What do FX140 owners say?

The FX140 product page shows 13 reviews with a 4.4 average. Three verified reviews, including the most detailed one:

• Gregory S., verified buyer, 4 stars, October 9, 2026: “Had it delivered to my apartment. The box was badly torn up but the bike had no damage inside of its steel cage. Put it together but had some problems getting it to start. Found that one of the wires would not stay connected and it was an easy fix. After that it started right up and idled smoothly. Warmed it up and put it in gear… It jumped forward and died. Had to make some adjustments with the clutch cable before it would shift properly. Everyone should keep in mind though that this bike cost about 1/3 the price of for instance a 140 cc Kawasaki dirtbike. It is a good looking bike and comes with a one year warranty. I look forward to hitting the OHV trails with it.”
• Aden, verified buyer, 4 stars, September 9, 2026: “Fired up instantly with the electric start—no kicking needed. The Zongshen engine is solid and powerful on trails. Brakes stop confidently, even downhill. Came mostly assembled; had it ready in under an hour. ... Customer support was quick and helpful.”
• Patrick M., verified buyer, 4 stars, August 6, 2026: “Just make sure you know what you’re doing when you build it. It’s pretty simple though for the most part”

Owners like the electric start, the engine and the brakes. Setup is where their experiences differ: one had it ready in under an hour, while another had to reconnect a wire and adjust the clutch cable. Plan an afternoon for assembly, and check the wiring connectors, the clutch cable and every bolt before the first ride.

Reviews quoted as posted on the FRP FX140 product page, checked October 13, 2026.

Which is the best 140cc pit bike for you?

If you want a dealer, adjustable suspension and electric start, and the rider fits without a published weight limit, the SSR SR140RB is the closest SSR to the FX140, at $2,249 before destination and fees. If you want the lowest listed weight and do not mind kick starting or 14/12 wheels, the SR140TR is 157 lb. If an Apollo dealer is close and the rider is within 165 lb, the Thunder 140 is a kick-start, air-cooled option.

If the rider is heavier, wants electric start on 17/14 wheels and a published speed and power figure, and you are fine assembling a bike that arrives by freight, the FX140 covers that for $1,149.99 plus $399.99 shipping. The FX140 product page has the full spec list, and the FRP dirt bike lineup shows where the FX125 sits below it.

FAQ

Where to go from here

If you want a dealer-backed bike with adjustable suspension, look at SSR's SR140RB. If you want electric start, a 265 lb rating and a 1-year warranty on a 17/14 chassis, look at the FX140.

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