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

[Mikey08]

Cool whats next?

 

[marshole82]

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]

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 Frame	2,775
Seat clamp
Cane Creek headset
Toseek Carbon fork	550
FSA expander nut	25
Syntace F99 stem (5deg, 100mm)	95
Easton EA50 flat bar	145
Kalloy seat post	275
WTB sst.x Saddle	325
Braking:	675
Avid SD7 levers (pair)	150
Avid SD7 Vee	150
Avid BB7 mech disc brake	250
IS mount
Avid BB7 Rotor	125
Drivetrain:	2,515
UN73 square B/B	245
Race Face Cranks	430
34t FSA chainring	30
Wellgo Pedals	525
Alivio 8spd Shifter pod	300
Casette	400
Chain	275
XT Rear mech	210
Skewers (pair)	100
Front wheel:	820
Specialized Stubby front hub	270
DT Swiss X430 rim	430
spokes/nips	120
Rear wheel:	1,075
Deore LX M585 rear hub	390
Mavic XM719 rim	460
spokes/nips	225
Tyres:	560
Schwalbe Furious Fred Folding 26x2.25	560

 

[marshole82]

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]

 

[marshole82]

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?

 

[Mikey08]

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.

 

[marshole82]

Adapter like this is a cheap option

I want to change from the bb7 once I can use the same lever/caliper on the rear. No way I can use different levers. My OCD will not tolerate it

 

[Mikey08]

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.

 

[marshole82]

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?