do you remember where this thing was
I forgot how terrifying that thing is a few episodes back we made Jimmy a super light bike
out of parts from AliExpress it came out just over six kilograms which is not light enough so
in today's episode we're gonna make it lighter super safe yeah what did it weigh last time I
think it was like 6.08 kilograms 6.08 does a bike change weight over time we've lost
not no yeah 0.01 of a kilo which is what 10 grams yeah 10 10 gram 100 Tango
we start with the stuff that people would could do at home without risk of breaking their bike
which is what else are we doing we're gonna do things that are going to risk breaking the bike
and then you're gonna make me roll your lovely bike again you're gonna make it less safe and
then make me ride it method number one nice and easy uh anyone could do this at home we
are going to replace the tires with much lighter ones because the weight of tires
can vary drastically these are Hutchinson Fusion 5 grid skins they're tubeless and they're quite
wide so they're 28 millimeter we're going to put these tires that we had lying around the
garage which are open tubulars by Victoria so a little bit narrower but I Hazard a bit a little
bit lighter to make this a fair test Jimmy we're using the same rubber band on both tires
thank you 256 grams for the Victoria 293 grams for the Hutchinson there is
a little bit of a weight saving there but that's not the main reason that I wanted
to change tires the main reason I wanted to change tires is because these being narrower
means you can use a tubelito s tube which is actually designed to be a spare super light
inner tube that packs down really small you can fit like three of these in your
saddle bag officially they're not rated for Rim brakes just don't tell Jimmy 80 lighter
then what then standard butyl inner tubes it says on the box 24 grams 23 grams how much is a normal
tube wait one more tube for reference whoa I told you into heavy that's legit 80 so I guess the 20
grams is added on to the weight of well actually no because then there's sealant in that isn't
there so this this is actually going to be a big saving isn't it yeah like tires very light tubes
those super light inner tubes I'm not saying it has to be a two millito you can get cheaper ones
a swab we do one and there's an AliExpress version that is lighter than going tubeless how are they
in terms of um like puncturing I have found you have to be really careful mounting them yeah and
you cannot use them in a tire which is too wide stretches too much don't punch it straight away
butile inner tube what I would always recommend if you're going bike packing or something like that
these expand to like you put that in a mountain bike wheel and you'll probably be okay these no
way can you fix them are they fixable yeah yeah steak what are you doing run up do that to 60 PSI
yeah we're gonna have to have another tire putting on competition you won last time I'm gonna win
done
really yeah you can finish off mine as well then he's been training
so the cassette that was actually on there which we didn't realize at first was your
SRAM one Oh I thought that was the cheap one no so it's actually your slam one on but I've just
discovered something very interesting which I was not expecting SRAM cassette 273 grams
ztto cassette also one piece same ratios watch this 232 grams that seems like a decent saving
40 grams difference this is made of aluminum and will wear out really fast what level of cassette
is this then yeah it's pretty good yeah but that's that's like that's probably how much do they cost
loads how much does this cost 20p or something yeah but that cassette will work the Ram one
was on there because you had it set up for your bike so we're putting the Chinese one back on
and it's actually going to say 40 grams 50 grams lighter well under six kilos foreign fluid ounces
three milliliters this cover that came from the seat post is not going back on the bike even
though it doesn't weigh very much every little helps this is marginal gains marginal losses
therefore marginal gains next project is the first bit of cutting we're going to reduce the length of
the seat post minimum insertion length is this so we need to measure that apply it to this
and then we can cut off whatever's left at the bottom minimum insertions 12 centimeters foreign
next up we're going to cut some more stuff off we're not going to adjust Jimmy's bike fit though
so we're going to leave the steerer with five mil of Stack um just because we want the bike
to fit him and for him to actually be able to ride it outside we're gonna go for the drops
you still want to be able to use the drop handlebars we want this bike to be usable
but light well I never use them but I think it'll look weird without them so I think we should still
keep them you'd never use your drops not really I think we should reduce them not remove them
that was definitely a bad idea for more than one reason I decided to come outside so we've got
some airflow so the carbon dust can dissipate away from us not sit in the room the tiny clothes room
that we're in which has no ventilation there's no episode next week you know why you're like
90 of the way through and that's still solid why is that not snapped you can still use that
this is definitely going to be the biggest drop from a single thing I think grip tape
the plugs not skateboards sake bar take plugs and then the drops because you know who needs drops
for some reason we don't have a file in this Workshop but when we do eventually get one which
will be from my house uh we'll file that probably put a bung in the end so it's not all spiky and
doesn't spike your hands if you were to do this at home you'd definitely want to put some sort of
thing in the end why would someone do this at homes or they might be racing
the struggle Hill Climb I don't care do it which is happening this weekend next is the
stupidest most silly thing I think it was cool you've ever that does not look cool
looks terrible which thing has reduced the weight of this bike the most I don't care
ways 684 grams the rotor that you've got from your old build with a q-ring
on it slightly smaller chainring five nine four so 90 grams lighter but if
we change the cranks we have to push out those press fit cups and replace it with
this BB which is almost certainly going to be heavier than that BB so is it worth doing
we found something extra good which is a plastic Shimano BB which is 20 grams layer
a lot lighter than the ceramic one unfortunately it's not ceramic so no ceramic BB for you Jimmy
I think it's going really well
the bike lighter is it actually going to make any difference to like the bike though
thanks for the million comments telling us to straighten the mech hanger last build video of
course we straightened the mechanga straight away the problem was the chain line on this
bike switching out the crank set to the rotor one has fixed all the issues it's definitely
working much smoother now all you need to fix your problems is a really expensive rotor crank
just a normal priced one that is compatible is also an option but it's not light it's on
it's a one by bike Jimmy so you don't need a front Mech braison thing it's
riveted on so I think this is the only way we're going to get it off
all of that effort for seven grams it's actually not bad I feel like
we've severely reduced the resale ability of this Frame final push Little Things
this can't make the braking any worse no you can't do that why not you can't do
that as well I'm drawing the line why because that won't even work
how does that make it better it's 12 grams
completely unnecessary Jimmy the sun is it's golden hour the Sun is setting soon this is
the final way and there's no more after this for the viewers at home we've been here a long
time is this the final way yeah this is the final way well until we do round two
isn't that heavier than the last time we waited we could take a lot of the outer off so you could be
really really strict on how much outer there is this bit of outer here on its own weighs about
12 grams and the other thing you could do skewers I know you can get titanium ones that weigh about
40 grams from both front and rear 430 gram weight saving was it worth of work Jimmy no