Radon Jealous XC sub 7kg mountainbike

[Fatbiker]

This is my first try at a weight weenie mountainbike. Where I ride, there is hardly any elevation, so no need for big cassettes. No rocks or sharp object either, so lightweight tires should be just fine. I am hoping to finish final assembly next week.



Frame Radon Jealous CF 1188
Fork Lauf TR Boost 969
Expander en topcap Lauf 41
Headset Acros 50
Crankset Ethirteen XCX Race 395
Bottom bracket C-Bear ceramic 65
Rear derailleur Shimano XTR 980 tuned 150
Shifter+cable Shimano XTR 9100 150
Cassette 3T Bailout 9-32 260
Disc rotors Ashima Ai 160mm 135
Brakes Formula R1 Racing 350
Handlebar Haero H.165 169
Grips Ritchey Superlogic 20
Saddle Smud 70
Seat post Darimo T1 Loop 80
Seat post clamp Radon 17
Pedals Xpedo M-Force 8 ti 215
Tires Schwalbe Furious Fred 732
Wheels Carbon-Ti naven + Stans Crest MK3 + tape 1310
Valves Peaty's 14
Sealant Stan's Race 60
Axles Syntace en Lauf 92
Bottle cages Tune 25
Bolts, spacers, etc. 50
Total 6607

[scant]

what did you do to make the rear derailleur so light? does xtr m980 10 speed shift well with xtr m9100 11 speed?

[Fatbiker]

what did you do to make the rear derailleur so light? does xtr m980 10 speed shift well with xtr m9100 11 speed?

Sorry for the late response. I bought it like this, so not sure what work exactly was done. If I would have to guess, most weight loss is down to the carbon pulleys and the rear carbon plate of the derailleur. Not sure if it shifts very well with 11 speed, but I read somewhere it (surprisingly) does.

[Fatbiker]

Change of plans. I managed to get a hold of a somewhat ratty looking Open One+ frame. Aim is to remove the paint to get a nice uniform finish and loose some weight in the process. At 940 grams the frame is a fair bit lighter compared to the Radon.

I also bought some nice weightweenie goodies: Nokon carbon cables, a SRAM 10 speed XX cassette and a Shimano XTR 10 speed shifter.

[mike]

Unless they have improved, the nokon carbon links will crack eventually. I would use the alloy ones instead

[Fatbiker]

Unless they have improved, the nokon carbon links will crack eventually. I would use the alloy ones instead

Didn't know that . We will see I guess. Just really wanted these for like forever. I am a sucker for impossible to find parts.

[Fatbiker]

Out with Schwalbe, in with Maxxis.

[Fatbiker]

Removing the paint from the Open frame is taking forever. Front end is almost done now. Weight of the frame is now down to 900 grams.

[kococchi]

Good luck building!
Can you send a photo of the xtr980?

[Fatbiker]

Managed to finish this the day for my first competition run. Still need to do some fine tuning, but I am really happy with the result so far.

[txomin]

Nice looking

Sent from my CPH2371 using Tapatalk

[Fatbiker]

My first race on the Open was also my last. Somehow the chain was lifted onto the chainstay during the (very muddy) race and cut a hole in the chain stay. Maybe because I don't have a cluth on the derailleur? The Radon is now built up with the parts of the Open. I must say it does look good. Maybe even better than the Open.

[scant]

well the lack of clutch rear derailleur certainly didnt help, but its carbon fibre & can be repaired