Up for sale is my recently completed Chrome Stealth Alpha. This bike has been a labour of love over the last several years and I will be sad to see it go, especially as I have not been able to ride it apart from a few test rides. Everything about this bike has been meticulously planned and well thought out and while in many ways this bike was my dream creation, I also realised very quickly after first trying it out, that I may well kill myself riding it with the insane amount of power and speed it offers.
This bike is a one of a kind in several ways. The Chrome is unique and this was the only Alpha made in this colour. I am told that the Stealth factory decided after making this frame that it was too hard to powder coat in Chrome and therefore did not offer it after this example. The rear tyre is the fattest you will see on any Alpha, period. In order to fit the monster 18x3" Shinko tyre in the swing-arm, I had to cut a small amount of the side knobs by hand.
Where-ever possible I colour matched the components with the black/chrome theme to keep the bike looking ace while selecting quality components where it matters.
Specs are as follows...
Frame/Swingarm - Chrome Stealth FUTR
Front fork - DNM USD-8 Air Fork 1-1/8" 203mm 20mm Axle (with Chrome fork protectors)
Headset - Cane Creek 40 Series
Rear shock - DNM Mountain Downhill Bike Rear Shock
Handlebars - Funn Flame On Flat Bar
Grips - Ergon GP1-L Large Ergo
Stem - Spank Spike Race Stem
Seatpost - Gravity Light FTC
Seatpost clamp - Hope QR Black 34.9mm
Seat - Selle San Marco Siena Saddle (Very comfy)
Front Wheel - 26" Nukeproof Generator
Front Tyre - Maxxis Minion DHF - Dual Ply
Front Mudguard - Zefal Deflector FM60
Rear Wheel/Rim - 18" Alloy Moped rim with stainless 12g spokes
Rear Tyre - Shinko SR 241 350-18
Front Brake - Magura MT5
Rear Brake - Magura MT2
Regen - Variable Regen sensors on both levers
Disc rotors - Magura Storm Rotors
Pedals - Shimano GR500 Flat MTB Pedals
Cranks - Alloy Crank-PCD 110 - 165mm
Chainrings - 38T, 52T, 60T
Rear Freewheel - 5 Speed Sunrace 14-28T (Ready for a derailleur if desired)
Chain - Shimano IG51
Chain Tensioner - 11T Aluminum Black
Motor - MXUS 3K Turbo with 10ml Ferro Fluid, Hub-sinks, upgraded (8AWG Silicone to the axle) phase wires, dual hall sensors/wires, and temp sensor
Controller - Adaptto Midi-E with custom heat-sink cooling (Unlocked)
Display - Updated Adaptto Midi-E display with black sides and USB charging
Throttle - Thumb throttle
Regen - Variable regen hall sensors with magnets attached to brake levers
Wires protection - Custom designed, 3D printed wire cover/bash guard and rubber sleeve
Battery - 2Kwh, 72V 30AH LiPo with in-line 160A circuit breakers.
Battery protection - 3X JST to Parallel port adaptors to allow 3X battery medics balancing while charging (see photo below)
Charger - Compact Alloy Shell 325W 75V with XLR connector
Max speed - 90kph+ with OVS 7
Range - 50-100km+ depending on terrain and riding style
Weight: Approx 48Kgs
Torque: 300NM in Boost mode
Power profiles - Eco: 3KW, Normal: 5.5KW, Boost: 12KW (these can be changed as desired)
Charge time: 80% 4 hours, 100% 6 hours
The bike is essentially new. The only components with some use are the front forks (came off my Fighter with about 1000km) and the battery which has about 30 light cycles on it, also from my Fighter.
As for performance, I have been able to push nearly 14KW through it, but that is dependant on battery temp, motor temp, charge state, etc, so I'm calling it a 12KW bike as this is what it can reliably achieve.
A few components and custom made parts on this bike need a special mention.
The Battery is made from 9X 10AH 6S Multistar packs in an 18S 30AH configuration with a custom harness and padding encased within heatshrink. One pack sits on top in order for this configuration to work. There is also 2X 80A circuit breakers in parallel that sit on top of the pack for protection. 3X JST leads run up to a 24 Pin Parallel port in the neck. This allows you to connect 3X 6S Battery medics while it is charging and balance the cells as they are charged resulting in much quicker and safer balancing. I love this solution so much I will be modifying all my other bikes with the same setup.
The Controller has been modified with heat-sinks to ensure it always remains cool. There is also a custom designed 3D printed wires cover/bash guard to protect with wires and make it easy to service.
The 60T front chain ring is huge, but does not look out of place and when combined with the rear 14T cog still allows pedalling at up to 65kph. The 52T chain ring is there to allow lowering the gear ratio when hill climbing or on single track and the 38T chain ring is for pedalling it home if the battery ever goes flat. In the rear the 5 speed rear cluster allows an easy move to a rear derailleur setup if desired. I have not bothered with one yet as the bike has so much power it is unnecessary, but I may add one down the track.
The MXUS 3K hub motor has been upgraded with 8AWG silicon wires to the axle, 10ml Ferro Fluid and HubSinks to allow for this huge power to be pumped through it without it getting too hot too fast. Blasting around in Boost mode up steep hills still gets it hot, but it will cool off really fast when cruising around town. It's harder to overheat in Normal mode and impossible in Eco mode. Keep in mind, Normal mode is still 5.5KW...the same as a Stock Stealth Bomber and Eco mode is 3KW...the same as a stock Stealth Fighter.
In Boost mode this thing wants to pop power wheelies all day long and will still lift the front wheel easily above 50Kph which is scary as hell. Even in Normal mode the front wheel will lift quite easily and the bike pulls very hard. Eco mode provides a very decent amount of power at 3KW which is more than enough to go exploring long range at decent speed without worrying about the battery going flat.
This bike can really do it all and I will be sad to see it go, but I am keen to sink my teeth into some other exiting projects so I simply need the funds to do so.
Asking price is $7000 ono.
As a guide, this bike has more than double the performance and far higher quality components than a new Stealth Bomber which costs well over $10000.
Feel free to ask any questions or make me an offer via PM.
The reason I am selling is I have several other projects I am very keen to get into, but need the funds first. I already have a Stealth Fighter I love riding, so the Alpha will just have to go unfortunately.
Last edited by Cowardlyduck
on Sep 26, 2018 7:23 pm, edited 5 times in total.