Tarmac Sport SL6 - weight savings

Discuss light weight issues concerning road bikes & parts.
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Vingleik
Posts: 5
Joined: Wed Apr 08, 2015 9:06 am

by Vingleik

Just finished upgrading my Tarmac Sport (58cm) Bought it as it was a fairly cheap option compared to the Comp and Expert, and wanted to build and upgrade it myself. Mostly to learn how to actually do it.

List of upgrades I’ve done so far:
Pro Vibe bar and stem (100mm x 40cm). Not the lightest option, but wanted alu stem and bar, and liked the reach and drop of the bar.

Ultegra 8070/6870 mix. Derailleurs and battery is from the old 6870-series taken of my previous bike, and added 8000-series brakes, crank (175 mm 52-36) and levers. Left side crank is Specialized ultegra power meter. DA disc rotors.

Bike came with some heavy DT Swiss, put on a pair of CL50s. Not the lightest option, but wanted deep section rims and the CLX is fairly expensive. Weight savings on the clx wasn’t worth the price difference with my budget.

Heavy parts that needs changing is obviously saddle (Specialized Toupé Sport weighs an astonishing 360g) and pedals (old Shimano 105 feels like 10kg). Calculated a saving of about 350g on those two parts.

As it’s currently set up it weighs in at 8,3kg. Which is a lot. Obviously I’m not a huge weightweenie, but I would like to explore the weight savings world without going totally bankrupt.

I’m 185 cm and 68kg, so there’s not a lot of weight to shave off there.

Image

sgtrobo
Posts: 63
Joined: Mon Dec 12, 2016 4:36 am

by sgtrobo

hey, that's a sweet build without breaking the bank. The CL50s are pretty darned good for a deep section aero wheel for the $$$ and weight
Never realized the Toupe was that heavy, holy mackeral!!! 0.o

by Weenie


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Vingleik
Posts: 5
Joined: Wed Apr 08, 2015 9:06 am

by Vingleik

Thanks! Yeah, went for the cheaper option when having some of the parts from a previous bike. Great value in doing the upgrades myself.

The Sport version of the Toupé is about £20. Why they fitted something like that on something else than the cheapest entry bikes, I have no clue.

Toupé expert weights a decent 150-ish grams. Lot to save for not the most expensive option.

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silvalis
Posts: 678
Joined: Mon Sep 07, 2015 1:02 am
Location: Aus

by silvalis

Are those the composite 105 pedals PD5700C?
They aren't heavy. 37g more than Dura ace pd9100.
Chasse patate

octave
Posts: 188
Joined: Sun Jan 15, 2017 8:47 pm

by octave

love the color! sorry not anything else to say but that.

oh and 68kg at 185cm!? chapeau!


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Js2
Posts: 109
Joined: Mon May 08, 2017 6:55 pm

by Js2

Saddle has to go imo, that's a boat anchor right there.

Bottle cage => Tune wassertrager 2.0 (@10-12g each~ i believe)
Dura ace pedals will save you a little bit


Anyway 68kg at 185 cm is already a ton of weight savings. Congrats on the bike :)

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Vingleik
Posts: 5
Joined: Wed Apr 08, 2015 9:06 am

by Vingleik

octave wrote:
Tue Jul 30, 2019 12:33 am
love the color! sorry not anything else to say but that.
Thanks. One of the reasons why I chose the Sport vs Comp.

silvalis wrote:
Tue Jul 30, 2019 12:13 am
Are those the composite 105 pedals PD5700C?
They aren't heavy. 37g more than Dura ace pd9100.
I belive it's the old PD-550. Had to use some old ones until I decide if I go for speedplay or Shimano. Internet says 310 g for the pair. I believe the new Ultegra ones are 250 and DA 230?

bruno2000
Posts: 863
Joined: Fri Jun 17, 2005 4:11 pm

by bruno2000

As said before, saddle, pedal and maybe seatpost?
Not much more to shave off, unless you are prepared to spend the money.
Maybe the Ultegra crank can be replaced by a Rotor Aldhu+?

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Vingleik
Posts: 5
Joined: Wed Apr 08, 2015 9:06 am

by Vingleik

Yep. Hopefully that will at least get me sub 8kg. Which, let’s be honest, isn’t great.

Will stick to Ultegra. I can’t justify the cost vs weight penalty.

Boshk
Posts: 391
Joined: Wed Jul 19, 2017 2:59 am

by Boshk

Very nice build!

You don't really have much options left to 'reduce weight'
-As you said, your di2 is pretty much set........maybe DA cassette but they are $$$.
-Saddle....this maybe a huge weight saving but it will cost you...Berks Lupina 90g saddle
-Pedal...ultegra are I think 260g
-Tires and inner tubes maybe...
-Stem to a Deda Superleggero 100m ...110g but its carbon

WorkonSunday
Posts: 109
Joined: Tue Jan 16, 2018 4:39 pm

by WorkonSunday

worth looking into latex inner tubes or even run tubeless.

try Elite Fly series bottles too, fair abit ligther than the tacx design.

also, are u willing to give up performance for lightness, if so, try lighter disc rotors like KCNC ones.
In the house: Colnago V1r, Colnago A1r, Wilier Cento1 Air, Scott Scale 700SL, Bianchi FSE, Colnago Concept, Colnago A1r, Specialized Ruze Pro, Wilier GTR

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Mockenrue
Posts: 477
Joined: Mon Aug 20, 2012 10:32 am
Location: UK

by Mockenrue

Boshk wrote:
Wed Jul 31, 2019 7:04 am
-Stem to a Deda Superleggero 100m ...110g but its carbon
No, it's alloy.

by Weenie


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