Initially a basic matte black 26” cruiser, with internal 3-speed gears and coaster brake. Reborn in a phosphoric acid rain as Acid, full suspension chop shop 29+ monster cruiser
The initial idea was to just give the bike a post apocalyptic look, Mad Max: Fury Road style, by grinding off paint and let the exposed steel rust, fit external gears and knobby tires.
-Then it all went a bit out of control...
Wider tires, 1.95” top vs 3.0” bottom
This required a wider and longer forks front and rear.
Let’s build a full suspension bike from a fork and a scissor jack
Still VERY tight clearance with a 3.0” tire on a 65mm rim
Shock legs. Final version left vs prototype right
Shock in place
Long travel rear swing demands more chain take up than the rear derailleur can handle, so here is its assistant
Headlight prototype
Metal version
Final version
First version tank plate. Turned out to be stainless steel. Unacceptable!
Maybe insert a logo in the tank plate
Digital sketch
Making of steel version
Done!
| Frame: | Cruiser by Biltema, CrMo. Acid washed | ||
| Fork: | DKW Diamant, anno 1938. Threaded 25.4mm steerer, non-BSA thread | ||
| Brake mount: | DIY, L-profile 25x25mm Q235 steel | ||
| Rear suspension: | Preferred usable travel 159mm. Travel after sag 117mm. Sag set at 42mm (=26% of total) at 85kg rider weight + bike unsprung weight. Spring travel used <54mm. Spring preload 46mm. | ||
| Rear swing arm: | Upper joint: scissor jack | ||
| Bifurcation: part of fork 26" MTB 'Action', CrMo | |||
| Lower legs: from 26" fork cruiser by Biltema, CrMo | |||
| Rear scissors: | Upper shanks 145mm, Lower shanks 109mm. 18x3mm C9D (SS 1312), 'bondjärn', semi hard | ||
| Brake caliper mount: | DIY, L-profile 25x25mm Q235 steel | ||
| Rear shock: | Legs: 18x3mm C9D (SS 1312), 'bondjärn', semi hard, tapped M5x0.75mm | ||
| Springs: SR Suntour SF15XCM-DS-RL(LO) HARD, art.no. 2220591060, length 232mm, spring const. (est.) 8.26 N/mm | |||
| Spring stops: 20mm pipe from hydraulic jack handle, recessed screw holes | |||
| Headset: | XLC steel threadless Ø 25.4/30.0/27.0 mm | ||
| Bottom bracket: | Shimano BSA square taper 114mm | ||
| Shifters: | Deore M592 3x9 | ||
| Chain tensioner: | Shimano Altus Rear Derailleur Long Reach RD-CT92 flipped | ||
| Rear Derailleur: | Shimano Deore RD-M592-SGS Shadow Rear Derailleur long 9-speed | ||
| Brakeset: | Shimano BR-MT200 hydraulic flat mount | ||
| Brake rotors: | Shimano SM-RT26 6-bolt 180mm/160mm | ||
| Chain: | Double CN-HG701 11s | ||
| Crankset: | Shimano Deore M592 2x9 | ||
| Stem: | 1950's 21.0mm | ||
| Bars: | Steel, mid rise | ||
| Seatpost: | Hydraulic jack handle, 20mm | ||
| Saddle: | Brooks B67 | ||
| Grips: | RFR lock on | ||
| Wheel front: | Gippieme Equipe Roccia Disc. IS 6 bolt. | ||
| Tire front: | Maxxis Minion DHF TR EXO 29+ 3.0" | ||
| Tube front: | Maxxis 29" | ||
| Wheel rear: | Rim: 65mm Double Wall, OLD 135 mm, ETRTO 622x65 mm. | ||
| Hub: JoyTech D762DSE, 8/9/10s HG freehub. Disc mount : IS 6 bolt | |||
| Tire rear: | Maxxis Minion DHF TR EXO 29+ 3.0" | ||
| Tube rear: | CrusierShop UltraFat 3" | ||
| Cassette: | Shimano Deore 11-34 9s, HG | ||
| Pedals: | Square bear trap | ||
| Lights: | Vicma Beta/KTM Ark Projectors | ||
| Light source: | LUXTAR LED Onyx H8, 4 chip, actual lumens 1840, 6400K, 1.4A, actual power 17W, IP67 | ||
Rear suspension movement video
Timelapse video:
Build thread:
https://ratrodbikes.com/threads/acid-reborn.118442/
Attachments
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