And so it begins...again - the Fire Mountain weight Loss project

marshole82

Old School Hero
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Build it for now! Might do wheels or chainset maybe saddle. I'm not sure to be honest. The rear hub has a bit of play in it so might go for something there.

Fancy a Tune/ZTR setup but it's bucks.
 

marshole82

Old School Hero
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OK i'm all weighed up, ive not included an random bolts and cables and grips, so the weight will be a bit on the light side, still lots of room for improvements.

Affordable changes are probably frame, saddle, seatpost. a nice wheelset would be great but can be pricey, especially as I'd like to keep a bit old school and run rim brakes and tubes, and I've guessed on the spokes/nips weight based on the full wheel weight less the hubs and rims (from google).

All this comes in at 9.835kg, weighed on kitchen scales, not digital!

I can probably shave around 1.5kg by changing to an ally frame, a charge saddle (£30), some wellgo mg1 pedals (£40ish?).

Frameset:4,190
1997 Kona Fire Mountain Shock Frame2,775
Seat clamp
Cane Creek headset
Toseek Carbon fork550
FSA expander nut25
Syntace F99 stem (5deg, 100mm)95
Easton EA50 flat bar145
Kalloy seat post275
WTB sst.x Saddle325
Braking:675
Avid SD7 levers (pair)150
Avid SD7 Vee150
Avid BB7 mech disc brake250
IS mount
Avid BB7 Rotor125
Drivetrain:2,515
UN73 square B/B245
Race Face Cranks430
34t FSA chainring30
Wellgo Pedals525
Alivio 8spd Shifter pod300
Casette400
Chain275
XT Rear mech210
Skewers (pair)100
Front wheel:820
Specialized Stubby front hub270
DT Swiss X430 rim430
spokes/nips120
Rear wheel:1,075
Deore LX M585 rear hub390
Mavic XM719 rim460
spokes/nips225
Tyres:560
Schwalbe Furious Fred Folding 26x2.25560
 

marshole82

Old School Hero
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i do love this frame though...i'm not sure why. perhaps i can find a lighter Kona frame.

Anyone have a Kona 18", 1 1/8" weighing around 1.6kg? as long as it's not bent or cracked I'm into it ;)
 

marshole82

Old School Hero
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So it's partially built up. I have a question though...

Forks are post mount but the rotors seem too big, I can't get the caliper anywhere near the post.

What adapter do I need and how do I know what size?
IMG20210402185633.jpg
 

Mikey08

Kona Fan
Get a 160 rotor. Or offer up the caliper and measure the gap to the post. It'll probably be 20mm so you need a 160 to 180 PM adaptor. I'd opt for a smaller 160mm rotor and may be able to help you out with one really soon...I'll drop you a PM. Smaller rotor will put less stress on the fork.
 

Mikey08

Kona Fan
You may be able to combine the BB7 front caliper with a lightweight v-brake on the rear and matching lightweight v levers.

Something like the KCNC VB6 levers and a VB6 v brake on the rear.

kcnc_bremsen_hebel[640x480].jpg
 

marshole82

Old School Hero
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Cheers Mikey!

Have seen these before but didn't think they work well. The sd7 is only 150g a pair of levers, ms 150g for the vee I have fitted. Yeah the bb7 and rotor sits at about 450g! So it's still a big saving, but I think a good lightweight hydraulic is the order of the day.

Re there lighter mech disc brakes?
 

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