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The reviewer analyzes the ZTTO SLR Gen 3 ultralight cassette, focusing on a specific failure case where the top two sprockets sheared off. They describe the cassette's construction: the top three sprockets are milled from a single aluminum block, with the rest being monolock steel, resulting in significant weight savings (117g vs. 260g for Shimano 105). The reviewer has personally used smaller versions (11-28T) for thousands of miles without issue but identifies a critical design flaw in larger sizes (11-30T and above). In these larger cassettes, the top two sprockets are connected to the third by a thin ring of supports, creating a potential cantilever beam effect and stress risers at sharp internal corners. This design, combined with spiky power delivery (e.g., in cyclocross) and the increased flexibility of larger sprockets, increases the risk of failure. The reviewer concludes that these cassettes prioritize minimal weight and low cost over structural safety margin and long-term durability. They advise caution, particularly for the 11-36T and 11-34T versions, and suggest stronger alternatives like ZTTO's all-steel or Gen 2 cassettes. They also note the shifting performance is decent but not as good as OEM, the cassettes are noisier, and aluminum teeth can snap if shifting under load.
Pros
- Incredibly lightweight (e.g., 117g for 11-28T vs. 260g for Shimano 105)
- Great looking and available in funky colors
- Low cost (about 60 quid)
- ...and 2 more
Cons
- Design flaw in larger sizes (11-30T, 11-32T, 11-34T, 11-36T): top two sprockets connected by thin supports, creating a weak point
- Risk of sprockets shearing off, as evidenced by a viewer's cassette failing after ~150km
- Sharp internal edges (90° corners) act as stress risers
- ...and 7 more
Key Points
- Brand: ZTTO, model referenced is SLR Gen 3
- Construction: Top three sprockets milled from single aluminum block, rest is monolock steel
- Weight: 117g for 11-28T size
- ...and 7 more
The reviewer does not mention the 'Ultralight SPEDAO SLR2 Road Cassette' at any point in the video. The entire transcript is dedicated to analyzing lightweight cassettes from the brand ZTTO, specifically their 'SLR Gen 3' model and other generations. The reviewer discusses a specific failure of a ZTTO cassette, analyzes its design, compares different sizes, and discusses alternatives like the ZTTO SLR Gen 2 and steel cassettes from ZTTO. The brand SPEDAO is not referenced.
aliexpress.comAffiliate by TraceVeloaliexpress.comAffiliate by MyBikePartsaliexpress.comAffiliate by Tom Bowers Cyclingaliexpress.comAffiliate by MyBikePartsThe reviewer analyzes the ZTTO SLR Gen3 11-speed cassette, focusing on a specific failure where the top two sprockets sheared off. They note the cassette is lightweight, visually appealing, and affordable. The design involves the top three sprockets milled from a single aluminum block with the rest being steel. The reviewer has used smaller versions (11-28T) for years without issue, but identifies a design flaw in larger sizes (11-30T and up) where the top two sprockets are connected by a thin ring of supports, creating a potential cantilever beam effect and stress risers. They attribute the specific failure to use on a rough cyclocross course with spiky power delivery. The reviewer concludes that these cassettes prioritize weight savings over durability and safety margin, advising caution with larger sizes.
Pros
- Great looking
- Incredibly lightweight (e.g., 117g for 11-28T vs. 260g for Shimano 105)
- Affordable (about 60 quid)
- ...and 1 more
Cons
- Design flaw in larger sizes (11-30T, 11-32T, 11-34T, 11-36T) where top two sprockets are connected by a thin ring of supports, creating a weak point
- Risk of sprockets shearing off, especially under high, spiky loads (e.g., climbing out of saddle on rough terrain)
- Questionable safety margin due to extreme material milling
- ...and 3 more
Key Points
- Brand: ZTTO
- Model: SLR Gen3
- Construction: Top three sprockets milled from a single block of aluminum, the rest is monolock steel
- ...and 6 more
aliexpress.comAffiliate by Trace Veloaliexpress.comAffiliate by MyBikeParts
The reviewer analyzes a failure of the ZTTO ULT2 cassette, specifically the 11-36T version, focusing on a design weakness in the top two aluminum sprockets. They explain the structural and use-case factors that likely led to the failure and compare the design across different cassette sizes.
Pros
- Lightweight (ultralight, prioritizes minimal mass)
- Visually appealing with nice colors
- Good value (built to a price point)
- ...and 1 more
Cons
- Potential structural failure point in the top two sprockets of larger sizes (30T, 32T, 34T, 36T)
- Design creates a cantilever beam effect and stress risers
- Less safety margin due to aggressive material removal
- ...and 3 more
Key Points
- The 11-28T version has a different, stronger web structure where only the largest sprocket uses thin support arms.
- Larger versions (11-30T, 32T, 34T, 36T) have a 'double stack layout' for the top two sprockets connected by a thin ring of supports, increasing failure risk.
- Larger sprockets are more flexible and act as longer lever arms, increasing stress.
- ...and 3 more
aliexpress.comAffiliate by Trace Veloaliexpress.comAffiliate by MyBikePartsThe reviewer analyzes the ZTTO Ultraight cassette, focusing on a structural failure in the 11-36T version. They explain the design flaw, compare it to the more robust 11-28T version they use, and discuss how use case and sprocket size affect failure risk. They conclude these cassettes prioritize weight over durability.
Pros
- Lightweight (prioritizes minimal mass)
- Visually appealing with colors
- Good value (built to a price point)
- ...and 1 more
Cons
- Potential structural failure in larger sizes (11-34T, 11-36T) due to design
- Sharp internal edges and 90° corners act as stress risers
- Thin support arms create a cantilever beam effect on top sprockets
- ...and 4 more
Key Points
- Failure observed on an 11-36T version used in cyclocross.
- Design differs by size: only the 11-28T version has a safer design where only the largest sprocket uses thin support arms.
- Larger sprockets act as longer lever arms, increasing peel-off forces.
- ...and 3 more
aliexpress.comAffiliate by Trace Veloaliexpress.comAffiliate by MyBikePartsUse this, no issues or limitations that I've found yet, used to pump up 29x2.6 tyres to 30psi, inflates road tyres no problem.
aliexpress.comAffiliate by MyBikeParts
I Turned a £700 Second Hand Bike Into This
Tom Bowers Cycling
The reviewer discusses swapping the original Altegra cassette for a SpeedOW monolock cassette purchased from AliExpress. They praise it as one of their favorite AliExpress products, highlighting its single-piece steel construction for durability and its light weight. They note it is significantly lighter than even a Dura-Ace cassette and is very affordable.
Pros
- Super durable due to single-piece steel construction
- Really light (weighs about 180 grams)
- Significantly lighter than a Dura-Ace cassette
- ...and 2 more
Cons
- The reviewer mentions having had loads of issues with AliExpress cassettes in the past, but clarifies these were mostly the hybrid aluminium type, not this specific model.
Key Points
- Made from a single piece of steel
- Weighs about 180 grams
- Cost about 45 quid
- ...and 1 more
aliexpress.comAffiliate by Tom Bowers Cyclingaliexpress.comAffiliate by MyBikePartsI Turned a £700 Second Hand Bike Into This
Tom Bowers Cycling
The reviewer mentions the ZTTO skewers only once, briefly. They state they are swapping the bike's original heavy, rusty skewers for these 'nice lightweight titanium AliExpress ones.' They note these are the same skewers they had just taken off their hill climb bike to replace with even lighter ones, and they decided to install them on the Trek bike because they were lying around in their parts bin.
Pros
- Lightweight
- Titanium construction
Cons
- Not the lightest option available (they were replaced on another bike for lighter ones)
Key Points
- Brand is ZTTO
- Source is AliExpress
- Material is titanium
- ...and 2 more
aliexpress.comAffiliate by Tom Bowers Cyclingaliexpress.comAffiliate by MyBikePartsI Turned a £700 Second Hand Bike Into This
Tom Bowers Cycling
The reviewer mentions swapping the stock saddle for a 'Riot saddle'. They state they could not use a super light carbon saddle due to the bike's clamping mechanism not supporting oval carbon rails, so they had to use a steel-railed saddle instead. They describe it as 'a bit heavy' but found it 'really comfortable riding'.
Pros
- The reviewer found it really comfortable for riding.
Cons
- The saddle is described as 'a bit heavy'.
- The reviewer could not use a super light carbon saddle as intended because the bike's clamping mechanism does not support oval carbon rails, forcing them to use a steel-railed version.
Key Points
- It is a steel-railed saddle.
- It replaced a stock saddle the reviewer disliked.
- The bike's clamping mechanism prevented the use of a lighter carbon saddle with oval rails.
aliexpress.comAffiliate by Tom Bowers Cyclingaliexpress.comAffiliate by MyBikeParts
Der BESTE günstige Smarttrainer? CYCPLUS R200 im Test
JULEZ | CYCLING
The reviewer provides a comprehensive review of the CYCPLUS R200 Smart Bike Trainer, covering unboxing, setup, specifications, and practical testing. They state it is a budget-friendly smart trainer with a claimed +/-1% power accuracy and 2200W max power. It supports ANT+ and Bluetooth 5.0, can simulate climbs/descents up to 19% when plugged in, and offers power-free riding for up to 2 minutes without being plugged into mains power. The trainer is compatible with major apps (Zwift, MyWhoosh, Rouvy, TrainerRoad, Kinomap) and bike computers (Wahoo, Garmin, IGPSport). They tested it in Free Ride and ERG mode workouts, finding it effective and stable, even during sprints. The reviewer notes it lacks a flywheel, which affects the feeling of inertia, and observed minor fluctuations in ERG mode power output. They conclude it offers excellent value for money and is a great entry-point smart trainer.
Pros
- Excellent value for money (good price-to-performance ratio)
- Effective training is possible
- Very easy to set up
- ...and 11 more
Cons
- Does not include a flywheel, leading to a less realistic, slightly abrupt feeling when accelerating compared to riding outdoors or more expensive trainers
- Shows slightly larger fluctuations in ERG mode (power varies around the target average rather than holding it exactly constant)
- Cassette is not included in the package
- ...and 3 more
Key Points
- Max power: 2200W
- Claimed power accuracy: +/- 1%
- Supports ANT+ & Bluetooth 5.0
- ...and 12 more
The reviewer presents the Zeno quick coupling system, specifically version two (V2), as a solution for easier maintenance and transport on bikes with fully integrated handlebars and internal routing. They received the kit for trial and have installed it on a bike. The reviewer explains the components, including the crimper, raw couplings, and pre-lined versions. They detail the connection mechanism, valve system, sealing components, and installation process. While they praise the concept for allowing easy handlebar removal, they also discuss practical difficulties with installation, potential air ingress, and cost considerations.
Pros
- Allows easy removal of handlebars for transport and maintenance without disconnecting hydraulic lines from levers/calipers.
- Seals fluid when disconnected via internal valves.
- The pre-lined connectors reduce initial cost for home users.
- ...and 3 more
Cons
- Installation is not the easiest; getting correct cable length and managing slack inside the frame is tricky.
- On a small frame, managing internal slack can be problematic.
- Initial installation caused handlebars to not stay straight due to internal hose strain, requiring disconnection and rotation at lever/caliper to remedy.
- ...and 4 more
Key Points
- This is version two (V2) with slightly slimmer fittings.
- The system consists of male and female quick-connect couplings that lock together with a pin-and-slot mechanism.
- Each end has a spring-loaded valve to stop fluid when disconnected.
- ...and 6 more
zenocycleparts.comStore LinkThe reviewer purchased a BXT gravel bike frame for approximately £300 after searching for the cheapest options. They unbox and examine the frame, noting it arrived in 4-5 weeks. The packaging was basic but protective. The frame is a matte-painted carbon model called the 'Gravel 135' with a UDH rear derailleur hanger, includes a seat post, handlebars, fork, and all necessary accessories like a thru-axle, bearings, and seat clamp. They are generally impressed with the initial quality for the price, noting the carbon weave is visible, the frame feels solid, and it has 50mm tire clearance. However, they note minor issues like paint overspray, a questionable headset bearing measurement printed on the frame, and a potentially loose bearing fit. They plan to build it with parts from their current bike to test ride it.
Pros
- Very affordable price (around £300)
- Comes with all necessary accessories (handlebars, fork, seat post, thru-axle, bearings, seat clamp)
- Frame feels nice and solid upon inspection
- ...and 8 more
Cons
- Basic packaging with no 'fragile' markings and a hole in the box
- Some paint overspray on the bottom bracket area and the thru-axle
- Seat post looks a bit thin and lacks measurement markings
- ...and 4 more
Key Points
- Brand: BXT
- Model: Gravel 135
- Material: Carbon fiber
- ...and 7 more
bxtbikes.comStore LinkI had the ZTTO SLR3 (gen 3, the one with 3 largest cog being 7000-series aluminum) HG 11-50 12 speed for about half a year or 900 miles. For the first 200 miles I was using the shimano XT M8100 long cage derailleur. It worked but there is always a little noise at some gear, either this or that one. I tried to fine-tune the shift cable tension, limit screw, B-screws. But you will always have a couple of gears that have the noise. Maybe it's just me who are sensitive but it really bothered me. But at the same time I really liked the lightweight-ness of it. (285grams!!!). So I bought the Wheeltop OX 2 mountain electronic derailleur and then fine-tune every cog. It worked beautifully since then (the past 700 miles). extremely quiet at each cog. I am loving it. the cassette cog-spacing must have not been very accurate for some cogs, but the Wheeltop electronic shifting system resolved the issue.
I am also 185cm with 86cm inseam riding a size 58 lcr018-d for a few weeks now. I'm using a zero offset post, 120mm stem, and 20mm of spacers. I'm very comfortable on it so far, happy I didn't go with a 56. I like the long and high setup.
lightcarbon.comStore Linklightcarbon.comStore Link
How Much Weight Can Titanium Bolts Really Save?
Tom Bowers Cycling
The reviewer does not specifically mention the 'SPARTS bicycle disc brake titanium screw for shimano R9270 brake system titanium bolt nut' as a distinct, named product. The transcript discusses a general 'S parts titanium bolts' kit designed for a Dura Ace Di2 groupset, which includes various bolts for components like brake calipers, derailleurs, and shifters. The reviewer installs and weighs these bolts throughout the video, focusing on weight savings and durability compared to stock Shimano hardware.
Pros
- The titanium bolts for brake caliper mounts offer a 'massive' or 'huge' weight saving (e.g., stock 13.9g vs. S parts 6.1g).
- Titanium is 'significantly stronger than aluminium' and 'more corrosion resistant', making bolts less likely to seize or round out.
- For certain parts, like the front mech bolt, the S parts kit is specifically designed for Dura Ace, providing the 'perfect size' where generic titanium bolts might be too long.
- ...and 3 more
Cons
- For parts where Dura Ace already uses aluminium, swapping to titanium can actually increase weight (e.g., rear derailleur B-bolt: stock 3.0g vs. S parts 4.1g; pad pin: stock 0.7g vs. S parts 1.0g).
- The overall weight saving from the full titanium overhaul is minimal (estimated 30-40 grams), which is within the margin of error of the scales.
- The cost is high ('nearly 100 quid'), making it hard to justify for weight savings alone.
- ...and 1 more
Key Points
- The reviewer used an 'S parts titanium bolts' kit designed for Dura Ace Di2.
- The main weight savings come from replacing steel bolts, not aluminium ones.
- The most significant weight savings were found on the brake caliper mounting bolts.
- ...and 3 more
aliexpress.comAffiliate by Tom Bowers Cyclingaliexpress.comAffiliate by MyBikePartsRegister as a reviewer:
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Register as a reviewer"Why risk buying cheap stuff from abroad?"
We love new bike tech and follow bike brands extensively. Riding bike can be a very price intensive thing, but it can be made more accessible by saving some money, and spend it on the parts that matter mostly for you. After a couple of thousand kilometers, most buyer can determine the quality themself. Some YouTubers already have a successful history with using cheaper parts from Aliexpress or eBay. To crowdsource those experiences, we've made this site, to seperate the wheat from the chaff. To be honest, there is also a lot of crap or mediocre stuff out there, but at the same time you can find reliable and quality stuff.