M5 Stumpjumper carbon hybrid

Seb K

This is my M5 Stumpjumper . Fine it is not a carbon frame but it's all I could find in my shed (I have a few Spesh full suss frames) .

Frame - M5 alloy full suss with custom titanium shock bolt hollowed out with cobalt drill bit and head smoothed down in the lathe then cut to length . Threads in rocker link re-tapped to standard pitch to mate with titanium bolt . Cable guides machined off painted . All bosses 'filled' with Schmolke carbon peek m5 bolts - heads removed and cut to length in the lathe to turn into grub screws . Headtube machined down to shorten height stack . Vinyl wrapped downtube with funky looking vinyl .

Rear shock - Custom DT Swiss carbon shock with lever removed and hex shape machined into lever holder to reduce weight .

Headset - Chris King bottom cup with custom aftermarket titanium crown race . Extralite low stack top cup and bearing with alloy compression ring machined down to flatten .

Handlebar - NewUltimate carbon bar with decals sanded off and clear coat removed a third of the way on either side of the bar . Shortened .

Stem - Syntace Flatforce stem with titanium bolts

Plug and cap - MCFK custom stem plug and alloy blue top cap bolt and Parts of Passion black top cap .

Fork - Manitou R-Seven R7 MRD Absolute 80 carbon woth steerer cut to length . Custom stickers installed and cable guide hole machined out a little more .

Wheels - 26" Easton Haven wheelset with rear wheel disc mounts (3) removed .

Brakes - Hope M4 custom brakes with aftermarket Goodridge blue braided hoses, titanium fixings, Schmolke carbon bolts machined in the lathe for the lever mounts . Straitline levers machined down and custom tianium fixings made from a Lezyine carbon multitool . Fibrelyte carbon reservoir caps finshed with anodised bue alloy Probolt fixings . Caliper arms machined down for more clearance . Lever clamp eyelets machined out more to accommodate Schmolke bolts .

Discs - Front Kettlecycles 180mm carbon ceramic rotor (with Hope alloy brake adaptor) and rear Carbonti carbon/steel rotor with 3 eyelets removed and machined to a design . Extralite rotor bolts

Grips - Ergon white racing grips with built in carbon bar ends finished with custom titanium fixings .

Shifter - SLX shifter with titanium bolt

Cables - KCNC alloy braided housing (lightest in the world) with Goodridge ferrules and Powercordz inner cable (lightest in the world)

Seatpost - AX Lightness premium seatpost with Parts of Passion clamps and cut to length .

Saddle - MCFK 3k carbon saddle .

Seatclamp - MCFK light carbon clamp with aftermarket blue barrel nuts and black titanium bolt

Cassette - XT cassette 9 spd

Derailleur - XT clutch derailleur with an anodised alloy screws, Token carbon fibre ceramic jockey wheels with red alloy bolts and Extralite M5 titanium pinch bolt

Chain - KMC red DLC chain and gold snap on link (makes it easier to find)

Chainring - Carbonti Carbon/alloy custom chainring (42 teeth)

Cranks - FSA K-Force light carbon cranks with custom aftermarket Racing Line red alloy crank bolt

Chainring fixings - Parts of Passion/Carbonti

BB - Token gold ceramic with gold spacers

Tubes - Schwalbe Evo 26"

Tyres - Schwalbe Raceking 2.2 26"

Seb K

No pics just as yet as I have just finished her off (the bike that is ) !!!

Here are some teasers .

Seb K

Been a while since I last posted for this bike . It was a project I nearly abandoned but I thought about resurrecting it again . So here we go .

Wheels are done .

We have the DT Swiss and Easton carbon rims laced with DT Swiss Aerolite spokes and Easton straightpull spokes to DT Swiss front hub (105grams) and Easton custom finish rear hub (not weighed) finished with dt swiss gold nipples .

Discs - Carbon ceramic front 180mm and Carbon Ti carbon fibre/titanium/steel rear 160mm

Skewers - Carbon Ti titanium custom blue finish rear and Tune U20 custom blue with carbon/titanium rod and lever

Cassette - custom Recon aluminium 11-28 anodised

Rotor bolts are by Extralite and are titanium hollowed .

Tubes are Schwalbe Evo light 70gram tubes

Tyres are Schwalbe Furious Fred light tyres @ 330grams each .

This wheelset is all custom built from the ground up and re-laced by myself . Some of the lightweight parts are left overs from my light bike and some are new parts .

Rear hub mounts have been machined down to save a bit more weight .

The wheelset weighs 1370grams and 2486grams with tyres, tubes, discs, skewers and cassette .

Very light but this wheelset is also strong . I could get the weight down more but this bike won't be fully weight weenie as my other bike as I want it to be a full on trail bike so it will need some additional strength .

More updates on the way . Still not sure whether to get a new frame or not . I love the Stumpjumper frame and it weighed less than 2kg with shock last time I weighed it so quite light for a large full suss aluminium frame . 















https://plus.google.com/u/0/photos/109616548525138237374/album/6073058005558781553/6073058010248872258?sqid=114945357919196374155&ssid=8ea5b212-390e-4266-821e-34e48e2b19e0

https://plus.google.com/u/0/photos/photo/109616548525138237374/6073460924120892274?icm=false&sqid=114945357919196374155&ssid=8ea5b212-390e-4266-821e-34e48e2b19e0

Seb K

Had to machine the headtube down a bit more as the steerer is still a little short . Lots machine work and after deburring I then had to cut the cups down as the internal sections of the headtube were shortened . This has saves over 30grams to boot .

I also machined a little pattern on the top of the headtube to try and make the top section look a bit nicer . I then used the wire brush on the rotary tool (high speed) to polish everything up .

I then took a new Carbonice carbon fibre clamp (handmade in Germany) and created a large counterink in the top hole to allow the new titanium bolt head (taken from seatpost) to sink in a little more .

I then machined the shifter clamp to fit with the carbon clamp .I removed the third eyelet as it isn't needed . I machined all the way round the clamp and took a good 10grams off .

I then machined two new titanium m4 bolts to fit in the clamp . I machined the heads right down in the lathe so they would fit in the hole and shortened the stems and deburred all edges .

I then machined a new carbon shifter cover from a 3k carbon sheet . This is to replace the SLX cover which looks ugly to me .

Finally I fiited a new 2017 Tune U20 QR set of skewers in blue . 22 grams for the set .

Still waiting on the brakes and new grips .

lawman

Don't feel the need to post on here much these days but good god that looks like a death trap! There is no way in hell I'd ride that!!

Seb K

lawman wrote:

Don't feel the need to post on here much these days but good god that looks like a death trap! There is no way in hell I'd ride that!!

Why ?!! :?

lawman

The headtube. And the headset. Don't get me wrong I like a light bike as much as anyone as a former (admittedly pretty bad) XC racer, but there's a limit. Cutting down the head tube and pretty going down past the weld and the cutting extra of the headset cups to make them fit is going a bit far imo. I value my teeth! Kudos for giving it a go to get the bike as light as possible, but I must ask why not start with a lighter frame?

Seb K

lawman wrote:

The headtube. And the headset. Don't get me wrong I like a light bike as much as anyone as a former (admittedly pretty bad) XC racer, but there's a limit. Cutting down the head tube and pretty going down past the weld and the cutting extra of the headset cups to make them fit is going a bit far imo. I value my teeth! Kudos for giving it a go to get the bike as light as possible, but I must ask why not start with a lighter frame?

I will be getting anew frame soon . The head tube is cut directly on the weld . The only reason why this was done was simply because the fork is rare and it was NOS . Unfortunately the shop had already cut the steerer . I had it on a different frame (FSR XC) so when switching to this frame the headtube was too long but I don't let that stop me .

Food for thought . I had an old Rockshox Judy fork . I drilled the for crown all the way through as part of a weight saving strategy . I rode that fork for over a year on my MTB commuter . Everyday on the road and offroad at the weekend . No cracks or anything . If you know where to machine you can take quite a bit of weight off any component .