Scott Scale JR mods

[geek81]

Just picked up a 2011 Scott Scale Jr 20 for my 5 yr old son... was going to upgrade the fork on his old Daimondback Octane, but I found a good deal on the Scale.

He took it for a spin, much better bike, fork is way better, and its noticeably lighter. Looking to make it a little lighter without breaking the bank. Have a new stem and bars I'm going to try. Next option is the cranks.

Does anyone know how heavy the stock ones are? Are they worth replacing with Sinz cranks? Thinking of making it a 1x and losing the front derailer and shifter.

He is 47" but growing - stick with 140 mm crank length or should I go shorter?

Not familiar with the type of cranks the bike has now, what type are they and what type/size bottom bracket would I need?

Was looking at these: Sinz Expert ISIS Crank Arms 140mm Black NEW! | eBay

Worthwhile upgrade? Or is it a marginal weight savings?

Thanks for the help.

[heckler11]

Does anyone know how heavy the stock ones are? Are they worth replacing with Sinz cranks? Thinking of making it a 1x and losing the front derailer and shifter.

Lasco double 140mm : 705 grams and BB 308 grams

New shortened truvativ fived 130mm with BBG (inside and outside) and one ring 32T with alu bolts : 526 grams.

[heckler11]

fork RST Capa: 1690 g (1800 g claimed)
front derailer: about - 190 g,
shifter revoshift - 85 g,
handlebars - 436 g steel, new Amoeba scud carbon cut to 540mm - 90 grams,
steam noname 60 mm - 185 g, new KCNC fly ride 100 g,
tires -1200 g, new shwalbe Moe Joe 20x1,85 - 540 grams
seatpost Promax 312 g, new Kokua 90 g
saddle Scott - 268 g - new kokua (super comfort for my son, and cheap for dad) 168 g

you can save about: 1,5 kg (3,3 LBS)

[geek81]

fork RST Capa: 1690 g (1800 g claimed)
front derailer: about - 190 g,
shifter revoshift - 85 g,
handlebars - 436 g steel, new Amoeba scud carbon cut to 540mm - 90 grams,
steam noname 60 mm - 185 g, new KCNC fly ride 100 g,
tires -1200 g, new shwalbe Moe Joe 20x1,85 - 540 grams
seatpost Promax 312 g, new Kokua 90 g
saddle Scott - 268 g - new kokua (super comfort for my son, and cheap for dad) 168 g

you can save about: 1,5 kg (3,3 LBS)

Thanks! That is very helpful!

[heckler11]

one mistake sorry. tires shwalbe mow joe 20 x 1,85 - 660 g (540 g save)

[Billinsd]

Does anyone know how heavy the stock ones are? Are they worth replacing with Sinz cranks? Thinking of making it a 1x and losing the front derailer and shifter.

Lasco double 140mm : 705 grams and BB 308 grams

New shortened truvativ fived 130mm with BBG (inside and outside) and one ring 32T with alu bolts : 526 grams.

BB is 68x118 did not weigh it
pedal 163g
crank arm 193g
cut off big ring 163g gone
small ring + spider (what's left of big ring) + crank = *413 g

Sinz crank arms and spider and 36T = 396g + 50g (assumed weight of 32T) = 450g

Compare to *413g + 193g second crank = 600g about 150g or 5 oz more than Sinz

In my case the weight savings was not worth it. However, going from a 34T to a 32T might be worth it.
Bill

[Billinsd]

My daughter's bike was 25.0 lbs fully stock, weighed at LBS. Now 23.5 after new IRD freewheel, trigger shifters, etc.

The front rim without the tire or inner tube was 1 lb and 10oz, including white reflector.

Stock tires were 23 ounces each without inner tubes. The new Kenda 8 block were 14 ounces for a difference of 9 ounces per tire or 18 ounces total

The steel stem weighed 130g (whole stem including bolts). I figured the steel handlebar was fairly light as well.

Bill

[Billinsd]

new Kokua seatpost 90 g
new kokua saddle 68 g

What is the length of the seatpost? Can I buy these parts in the US?
Thanks
Bill

[heckler11]

Kokua saddle 168 g not 68g

[heckler11]

(i'm form Poland)
lok here:
saddle: LIKEaBIKE Jumper Saddle LIKEaBIKE balance bikes - The original balance bike

seatpost: LIKEaBIKE Jumper Seatpost LIKEaBIKE balance bikes - The original balance bike

but i have this in scott spark jr 20"