The Mondince FM126 is a value-oriented aero road frame made by Longteng (also sold as Longteng RD302 and by Light Cycling) with geometry closely following the Specialized Tarmac SL8. Early owners documented a string of problems including a poorly fitting crown race, incorrect Di2 battery mount, bottom bracket flex under hard sprints, and at least one seat tube crack, but Mondince has responded with revised parts and replacements. A later revised frame and a separate reviewer build both report careful finishing, no creaking or flex, and a stiff, stable ride, suggesting the teething issues may be resolved, though measured weights (950–1,172 g) are higher than early sub-800 g claims.
Pros
- Good value for the spec: T47, UDH, aero shape and integrated cockpit at about $765–950.1
- Made by Longteng, an OEM for brands such as Cube, Argon 18 and Ribble; also available as Longteng RD302.1
- Geometry closely follows the Specialized Tarmac SL8.1
- A revised frame impressed with carefully finished surfaces, no cracks or delamination after 1,000 km and stiffness the owner compares to an Orca OMR or TCR.1
- Owners describe the ride as fast and confident in corners, stable on descents above 70 km/h, with a responsive front end.1
- Mondince responds to problems: revised crown races were sent to early buyers and cracked frames were replaced.1
- Clean workmanship with no frayed carbon visible, flawless chameleon paint, and no creaking, rattling or noise during rides.2
- Stable and stiff feel including under hard efforts near 1000 watts, with no noticeable flex suggesting the known flex issue has been improved.2
- Aggressive and direct steering that is fun to ride; brakes performed well with strong stopping power after bedding in.2
Cons
- Early frames had a badly fitting separate crown race leaving a visible gap at the fork crown; a revised crown race fixes it.1
- Marked lateral flex at the bottom bracket under 1,000 W+ sprints for one 80 kg rider, more than a LightCarbon LCR018; Mondince says it passes ISO and that newer batches are stiffer.1
- Durability doubts: one frame cracked in the seat tube after a few weeks, its replacement arrived broken, and a third frame was still pending two months later.1
- Some frames appear to have been sanded too thin before painting, and early samples showed carbon fraying at rivnut holes.1
- Weight claims grew from sub-800 g to 950–1,170 g measured with hardware and paint.1
- Advertised as monocoque but bonded from two moulds.1
- Low trail (about 49 mm) on sizes 56 and up from a 74° head angle and 47 mm offset may make steering twitchy.1
- The cancelled Indiegogo campaign brought delays, price changes and inconsistent communication.1
- The supplied Di2 battery mount was the wrong size for some owners.1
- Poorly machined hole for the front derailleur cable that required drilling out, and a cosmetic scratch on the fork out of the box.2
- One instance of front-end wobble during no-hands riding on smooth asphalt.2
- Increased pressure on the palms due to a more aggressive riding position; saddle was cheap and required careful adjustment.2
- A couple of gears did not shift properly initially and needed fine-tuning via the L-Two app.2
Key Facts
- Measured frame weights: size 54 SL painted 1,172 g with 549 g uncut fork; size 54 UL raw with hardware 950 g; size 58 measured 1,127 g with 553 g fork (claimed SL about 1,055 g painted in 56).12
- Tyre clearance 32 mm official (5.5 mm per side); about 35 mm fits with less margin, 40 mm gravel tyres do not.1
- T47 threaded bottom bracket and UDH derailleur hanger.1
- Claimed T1100/T800/T700 carbon; bonded from two moulds despite monocoque marketing.1
- Sizes 49, 52, 54, 56, 58, 61; fork offset 47 mm in all sizes, head angle 74° on 56+ giving low trail (~49 mm).1
- Headset uses 52/40 mm bearings, 8 mm tall upper and 7 mm lower, 45/45; 1-1/2" lower, 1-1/8" upper.1
- Seatpost 350 or 400 mm, 0 offset available; minimum insertion stated 120 mm but Mondince accepts 90–100 mm.1
- Price about $765 frameset, $850–950 with integrated bar (360–420 mm widths, 80–120 mm stems), shipping about $150; reviewer paid €570 including €130 shipping and customs.12
Reviews & Ratings
18:03The reviewer discusses the Mondince FM126 carbon frameset as the basis for a custom bike build, noting that he received it at a discounted price in exchange for an official video mention. He describes the frame as well-finished overall, with a stable and stiff ride feel, attractive chameleon paint, and a competitive weight. He reports that known issues from online forums—such as excessive flex and a large fork crown gap—appear to have been addressed in his sample. However, he notes a poorly machined hole for the front derailleur cable, a cosmetic scratch on the fork, and a one-time front-end wobble during no-hands riding. He rates the frame around 8 out of 10 and considers the self-build worthwhile.
16:48The reviewer chose the Mondince FM126 full-carbon road frame as the heart of a cost-efficient road bike build using exclusively Chinese parts. He notes he paid for the frame but received a discount, so he flags the video as advertising. He describes the frame as full carbon with a chameleon paint finish that shifts color with the light, and says it was delivered with a cockpit (handlebar), fork, and headset bearings. He states the review will still be neutral and honest, and that he is aware of known 'childhood diseases' (teething issues) with this frame from relevant forums, which he plans to check whether they have been fixed in the final part of the series. He also discusses geometry fit generally, recommending comparing a well-fitting bike's geometry via Bike Insights against the frame's geometry, and advises sizing down when between sizes.
37:12The provided transcript does not contain any mention of the Mondince FM126. The excerpt consists of a German-language bike build video (Part 2) covering battery installation into a seatpost, carbon paste application, headset bearing assembly, fork/cockpit setup, and handlebar cutting. No bike part named 'Mondince FM126' is referenced anywhere in the text, despite the claim that it is mentioned around 0:35.
The Mondince FM126 is a 2026 aero road frame made by Longteng (also sold as Longteng RD302 and by Light Cycling). It has an SL8-like geometry, T47 bottom bracket, UDH and 32 mm official tyre clearance, and costs about $765 for the frameset or $850-950 with an integrated bar. The Indiegogo campaign was cancelled and frames are now ordered directly. Early owners documented a string of problems: - a poorly fitting crown race that leaves a gap, fixed with a revised part; - an incorrect Di2 battery mount; - marked bottom bracket flex under 1,000 W+ sprints; - a seat tube crack after a few weeks; - a replacement frame that itself arrived broken, with a third frame still pending. The frame is advertised as monocoque but is bonded from two moulds, and claimed weights rose from sub-800 g to 950-1,170 g measured. Mondince says later batches are stiffer. An owner with a revised frame reports careful finishing, no cracks after 1,000 km and stiffness comparable to an Orbea Orca OMR or Giant TCR, which supports that claim but is a single report. Low trail on sizes 56 and up (74° head angle, 47 mm offset) is a handling concern on paper; riders so far describe it as responsive but stable above 70 km/h.
AI Summary
Pros
- Good value for the spec: T47, UDH, aero shape and integrated cockpit at about $765-950.
- Made by Longteng, an OEM for brands such as Cube, Argon 18 and Ribble; also available as Longteng RD302.
- Geometry closely follows the Specialized Tarmac SL8.
more pros in the review
Cons
- Early frames had a badly fitting separate crown race leaving a visible gap at the fork crown; a revised crown race fixes it.
- Marked lateral flex at the bottom bracket under 1,000 W+ sprints for one 80 kg rider, more than a LightCarbon LCR018; Mondince says it passes ISO and that newer batches are stiffer.
- Durability doubts: one frame cracked in the seat tube after a few weeks, its replacement arrived broken, and a third frame was still pending two months later.
more cons in the review
Key Points
- Claimed T1100/T800/T700 carbon; bonded front and rear sections despite monocoque marketing.
- T47 threaded bottom bracket, UDH.
- Tyre clearance 32 mm official (5.5 mm per side); about 35 mm fits.
more key points in the review
Where to Buy
mondincecycle.com Price last checked 6 months ago | $765+ $150 shipping |
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