Nobl

Proto DH01 12

13123 of 17404
(15 people)
troy
11/22/2014 2:53pm
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Parts
Brand
Model
Additional info

Parts

Rear Shock
Marzocchi
Roco RC Worldcup Rear Shock
Custom valved
Rear Shock: Marzocchi Roco RC Worldcup Rear Shock. Misc: Custom valved
Fork
Marzocchi
888
Custom shimmed cartridge inside
Fork: Marzocchi 888. Misc: Custom shimmed cartridge inside
Headset
Cane Creek
Double XC Flush
1.5"
Headset: Cane Creek Double XC Flush. Misc: 1.5"
Handlebar
Kore
OCD
800mm. 20mm raise
Handlebar: Kore OCD. Misc: 800mm. 20mm raise
Stem
Funn
MZX2 MKII
45mm
Stem: Funn MZX2 MKII. Misc: 45mm
Grips
ESI
Extra Chunky
Grips: ESI Extra Chunky
Brakes
Magura
Louise Disc Brake
UNEX steel braided hose
Brakes: Magura Louise Disc Brake. Misc: UNEX steel braided hose
Brake Levers
Shimano
Deore Servo Wave
Brake Levers: Shimano Deore Servo Wave
Shifters
Shimano
LX M580 9SP Trigger Shifters
Shifters: Shimano LX M580 9SP Trigger Shifters
Rear Derailleur
Shimano
XT M772 Shadow 9-Speed Rear Derailleur
Custom SS cage
Rear Derailleur: Shimano XT M772 Shadow 9-Speed Rear Derailleur. Misc: Custom SS cage
Chainguide
Gamut
P40 Chainguide
E13 LG1+ lower cage
Chainguide: Gamut P40 Chainguide. Misc: E13 LG1+ lower cage
Cranks
Race Face
Atlas FR
170mm
Cranks: Race Face Atlas FR. Misc: 170mm
Chainrings / Sprocket
FSA
32 tooth
Chainrings / Sprocket: FSA 32 tooth
Bottom Bracket
Race Face
X-Type DH
100mm
Bottom Bracket: Race Face X-Type DH. Misc: 100mm
Chain
Other
Connex 9SL
Chain: Other Connex 9SL
Cassette / Rear Cog
Shimano
Tiagra
6speed
Cassette / Rear Cog: Shimano Tiagra. Misc: 6speed
Pedals
Shimano
Saint PD-MX80
Pedals: Shimano Saint PD-MX80
Front Rim
Alex
Alex Supra BH DH Rim
Front Rim: Alex Alex Supra BH DH Rim
Rear Rim
Mavic
EX721
Rear Rim: Mavic EX721
Hubs
Hope
Pro 2
Hubs: Hope Pro 2
Spokes
DT Swiss
Competition
2.0/1.8 R || 1.8/1.6 F
Spokes: DT Swiss Competition. Misc: 2.0/1.8 R || 1.8/1.6 F
Front Tire
Maxxis
Minion DHF 2.5 ST
Front Tire: Maxxis Minion DHF 2.5 ST
Rear Tire
Maxxis
Minion DHF 2.5 ST
Rear Tire: Maxxis Minion DHF 2.5 ST
Saddle
SDG
I Fly
I-Beam
Saddle: SDG I Fly. Misc: I-Beam
Seatpost
SDG
I Beam
Seatpost: SDG I Beam
Seatpost Clamp
Other
Accent
34.9
Seatpost Clamp: Other Accent. Misc: 34.9
General Info

General Info

Model Year
2014
Model Year:
2014
Riding Type
Downhill
Riding Type:
Downhill
Additional Info

Handmade, TIG welded 4130 frame with 7075 T651 alu rockers. 8" of travel, 1" of rearward axle path. 150x12 Maxle type dropouts, 8" Post Mount brake boss (no adaptor needed), 1.5" HT, HA 62.5-64*, WB 47.25", CS 17.125", BBH 13.85" . Modified Manitou Travic TPC+ Cartridge fitted into 888 chassis. Custom made short cage for XT der.

Additional Info:

Handmade, TIG welded 4130 frame with 7075 T651 alu rockers. 8" of travel, 1" of rearward axle path. 150x12 Maxle type dropouts, 8" Post Mount brake boss (no adaptor needed), 1.5" HT, HA 62.5-64*, WB 47.25", CS 17.125", BBH 13.85" . Modified Manitou Travic TPC+ Cartridge fitted into 888 chassis. Custom made short cage for XT der.
troy
11/22/2014 2:53pm
13123 of 17404
12 comments

View replies to: Proto DH01

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Thomsen
9 years ago
That´s a clean build. In your creation you really showed the beauty of steel.
Would you tell something about the tubing?
Have you used sheetmetal? What wallthicknesses have you used in which places?
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troy
9 years ago
Hi! It is 4130 normalized aircraft tubing. Used sheetmetal only for shock mount near BB. Wall thickness vary from 0.049" to 0.078". Dropouts and CS clamps are made of different kind of steel.
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troy
9 years ago
Yeah... just tied it up with some zip ties, so i could take it for a ride. Will work on that later
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connnordoll21
9 years ago
Wow! Really cool! I like the use of a BB (or two of them in this case) as bearings! One question though, (not trying to citizen but just wondering) why do you have the bottom arm, the one in witch the upper chain pull runs, so far back, does it make a smoother linkage, or create the suspension kematics you were looking for? It just seems like it chain stay length way longer! But very cool build! Love the Cromo!
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Daniel_Layton
9 years ago
I second the creative use of BB and also second the query on chain stay to seat tube pivot placement.

I'm going to guess that it had to do with preserving a specific wheel base and wheel path (had the pivot been located further forward then if the rear triangle dimension don't change then it will have a shorter wheelbase. If the rear triangle were to get longer to keep the wheelbase then then wheel path would be more rearward and less upward.) I presume that the rockers dimensions and placement were the main tuning factor for suspension rates.

PS i love the cleaver use of a idler concentric with the chainstay to seat tube pivot (thereby allowing you to have an ultra high IC and the nice back and up wheel path without detrimental chain growth) while then also putting a pivot on the chainstay near the junction with the seat stay to create a small amount of chain growth and presumably some antisquat. Brilliant.
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troy
9 years ago
Pivot placement was designed to achieve specific axle path, leverage curve and anti squat values.