Light bicycle Chinese vs Fulcrum Quattro Disc Wheelset

Everything about building wheels, glueing tubs, etc.
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Chinese 45,55 or fulcrum 40

1.45mm Chinese
2
22%
2.55mm
1
11%
3.45mm front, 55mm rear
3
33%
4.fulcrum 40mm
3
33%
 
Total votes: 9

MarkOneToo
Posts: 5
Joined: Tue Jun 27, 2017 5:44 pm

by MarkOneToo

Hi guys, looking to make my first wheel upgrade on my caad12. I've messed around for months (including two months wasted by dengfu increasing prices and over promising), and am now raising my budget. Maybe I'm looking for support for the Chinese builds, not sure.
My three options are :
1) Light bicycle 45mm deep u-shape rims, sapim x-ray spokes with brass nipples, dt240s hubs. Around 1469g
2) Or the 55mm version at around 1679g
3) Or some Fulcrum Racing Quattro Carbon H.40 Disc Wheels (40mm, fulcrum hubs, alu nips and generic spokes I think) - around 1605g

I've read here aero before minimal weight differences (especially when I could easily lose 2kg myself)... But had not really considered 55mm before.... 45mm front, 55 rear?
Would /should the Chinese wheels be considerably better than the fulcrum, considering the hubs and spokes?
All the wheels will cost about $1000 per set.
Oh.. And I'll be riding in japan. It's quite mountainous (imagining switchbacks not vertical climbs like here in thailand) but with good tarmac and many flat routes too I think.

Thank you very much for any help /advice

by Weenie


Hexsense
Posts: 462
Joined: Wed Dec 30, 2015 12:41 am

by Hexsense

get LB 46 rather than a LB 45.
It's wider inside so lower rolling resistance (or more cushion if lower pressure), up size your tire without extra weight of bigger tire.
wider outside so it'll end up being more aero with any tire with actual width (mounted on the rim) more than 24mm.

Front has more effect in reducing air drag than rear. The reason for rear deeper than front is handling/control in cross wind. If that is no problem for you rear deeper than front is like putting weight on the wrong spot (55f+45r is more aero than 45f+55r). But normally the reason people use 45 against 55 is not the weight, it's the handling safety in wind.
In anycase, get LB 46mm (28mm outer width and 21mm inner width) up front. Then decide on your rear, which i also put my bet on the LB46 too (or Venn 507 with 50mm deep and equally as wide) because you'd want tire atleast as wide as the front in the rear.

https://www.lightbicycle.com/Road-bicyc ... lable.html

waltthizzney
Posts: 217
Joined: Mon Jun 20, 2016 6:35 pm

by waltthizzney

Light Bicycle's wheels are actually ahead of most name brand carbon wheels other than the big players. They are phenomenal for the price and have changed my mind of Chinese carbon. There is literally ZERO reason to go with Fulcrum, Enve, Zipp ect,

MarkOneToo
Posts: 5
Joined: Tue Jun 27, 2017 5:44 pm

by MarkOneToo

waltthizzney wrote:Light Bicycle's wheels are actually ahead of most name brand carbon wheels other than the big players. They are phenomenal for the price and have changed my mind of Chinese carbon....


Wow,that is a ringing endorsement if ever i heard one! Thanks a lot :-)

MarkOneToo
Posts: 5
Joined: Tue Jun 27, 2017 5:44 pm

by MarkOneToo

Hexsense wrote:get LB 46 rather than a LB 45.
...... normally the reason people use 45 against 55 is not the weight, it's the handling safety in wind.


https://www.lightbicycle.com/Road-bicyc ... lable.html


That's great, detailed advice thank you - do you use them? I see the 46 is V-shaped not U-shaped.. Much difference in performance /handling? Just applied for a quote... Fingers crossed I can afford them!
Thanks again

MarkOneToo
Posts: 5
Joined: Tue Jun 27, 2017 5:44 pm

by MarkOneToo

Hexsense wrote:get LB 46 rather than a LB 45.
It's wider inside so lower rolling resistance (or more cushion if lower pressure), up size your tire without extra weight of bigger tire.
wider outside so it'll end up being more aero with any tire with actual width (mounted on the rim) more than 24mm.
good point. I have been riding 25mm front, 28mm back (not sure if I should be, but I'm feels good, and that's what I have!)

Hexsense
Posts: 462
Joined: Wed Dec 30, 2015 12:41 am

by Hexsense

MarkOneToo wrote:
Hexsense wrote:get LB 46 rather than a LB 45.
...... normally the reason people use 45 against 55 is not the weight, it's the handling safety in wind.


https://www.lightbicycle.com/Road-bicyc ... lable.html


That's great, detailed advice thank you - do you use them? I see the 46 is V-shaped not U-shaped.. Much difference in performance /handling? Just applied for a quote... Fingers crossed I can afford them!
Thanks again

Enve rolled back to V-shape on their modern wider wheels.
Reynold and Campagnolo (mostly) doesn't get on U-shaped trend at all.
Apparently companies realize that Brake track end must be wider or at least close to tire's width for the best aero performance.Rim must not be crazy wide (>30mm) to maintain compatibility with frame and brake calipers in the market (at least for now). U-shape get narrower at brake track while modern V-like shape (it's not really a V but close) is wide there so it perform better for wide tire. Stability is good too if it is properly designed. Reynold 58mm test way better in stability than Zipp 404 (60mm) in Tour megazine despite being V-shape is a good example.

I use it. One rim in the front as i only need front rim replacement while my rear is still good. It perform perfectly and really stable. When my rear rim need replacement i'll go for wide rim like this too.

If the price is too high, drop the hub to dt-swiss 350. Either front only or both. There is only small weight penalty there. Or you can use Novatec hub in the front but Dt-swiss in the rear then it'll be lighter. Front hub is simple enough that most of the time you don't need fancy hub.

PS. you said you normally ride in Thai? I'm Thai but living in Louisiana, USA.

MarkOneToo
Posts: 5
Joined: Tue Jun 27, 2017 5:44 pm

by MarkOneToo

Hexsense wrote:
MarkOneToo wrote:
Hexsense wrote:get
PS. you said you normally ride in Thai? I'm Thai but living in Louisiana, USA.

Good knowledge and thanks for the extra info

Yep I'm on koh Samui.. But it's certainly not the best place in Thailand to be cycling! I hope you're enjoying yourself in the states

by Weenie


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