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Messages - St0mpB0x

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1
Component Deals & Selection / Re: IIIPRO ROTORS
« on: May 03, 2024, 08:30:15 PM »
Quote from: Serge_K on May 03, 2024, 10:03:48 AM
Strange. I'm no engineer but I wonder, given that steel is steel, why rotors would perform drastically differently. Maybe hardness / durability, heat dissipation, resistance to warping and what not, but I would have thought a steel rotor is a steel rotor, outside of "extreme" use (super long descent, heavy rider...).
I don't have enough experience with disc brakes myself to have formed a view from experience.
Given the prince difference between my rotors and what Shimano charges though, there would have to be quite literally a magical difference in performance for me to try Shimano ones.

I'm nearly an engineer and steel is definitely not just steel. The same steel alloy can have a factor of 4-5x difference in yield strength depending on how it is processed. A very famous example of variation in material properties is the ductile-brittle transition temperature. This transition temperature changes with the specific alloy of steel used. I'm not sure what properties make a good brake rotor but if you forced me to take a stab in the dark, I'd guess hardness is quite important. Again, this can have a very large spread across different steel alloys and even a pretty large spread within how those individual alloys are processed.

2
Component Deals & Selection / Re: Super light Chainring 52, 36 for Dura Ace r9270
« on: April 16, 2024, 06:19:58 AM »
How do the Zrace rings save 20g? Is there a different model I can't find?

Listed Zrace 52/36 weight - 148g
Listed Zrace 50/34 weight - 132g
Zrace Bolts + Cover - 29g

Durace 9200 50T - 107g
Durace 9200 34T - 32g
Durace Chainring Bolts - 6g

3
Road Bike Frames, Wheels & Components / Re: Any good bar tape out there?
« on: April 14, 2024, 05:49:27 AM »
I really like the Onirii silicone bar tape. It's a little heavy but nice feel which you can customize pretty easily by how tightly you wrap it. Light tension for a bit thicker and softer. High tension for thinner and firmer.

4
Component Deals & Selection / Re: Super light Chainring 52, 36 for Dura Ace r9270
« on: April 06, 2024, 07:59:37 PM »
Can you share a link to one? I can't find any apart from the Cybrei which might save you 5g.

5
Component Deals & Selection / Re: Super light Chainring 52, 36 for Dura Ace r9270
« on: April 05, 2024, 08:11:28 PM »
If you want to reduce the weight of that part of your bike you are going to need to change the crank arms and not the chainrings.

6
Component Deals & Selection / Re: Super light Chainring 52, 36 for Dura Ace r9270
« on: April 05, 2024, 08:09:42 PM »
I don't think anything lighter really exists.

Cybrei do an alluminium set that is about 25g heavier. They also do a carbon/alluminium set that is about the same weight but probably shifts worse.

Carbon-Ti also do a set which is about the same weight give or take a few grams that'll set you back about 430 EURO.

The construction method of the Dura-Ace chainrings is incredibly light and stiff. It's pretty hard to beat by machining a chainring out of a lump of alluminium like most aftermarket manufacturers.

7
Component Deals & Selection / Re: Ali express disc brake pads, recommendations
« on: April 04, 2024, 05:20:22 PM »
I assume it is the latest video from Trace Velo on YouTube.

8
Road Bike Frames, Wheels & Components / Re: Adapt bikes AT-B01
« on: February 02, 2024, 06:48:05 PM »
Tavelo have another road frame listed on their website, the "Neuroman", but it's basically a dead link. I'm curious if it will turn out to be this or something else entirely.

9
Road Bike Frames, Wheels & Components / Re: Adapt bikes AT-B01
« on: January 16, 2024, 03:37:53 AM »
870g Apparently.

10
Road Bike Frames, Wheels & Components / Re: Adapt bikes AT-B01
« on: January 08, 2024, 04:06:26 AM »
Tavelo have a new bike listed on their website without further information so it might be happening.

11
Road Bike Frames, Wheels & Components / Re: Adapt bikes AT-B01
« on: January 05, 2024, 09:58:10 PM »
I'm super curious about their new 2024 model. I think Tavelo will be getting it as well but I'm uncertain.

12
Component Deals & Selection / Re: ZRace RX crankset - broken
« on: October 25, 2023, 06:08:35 PM »
Also, Driveside or Non-Driveside?

From what I can make out from the pictures the failure surfaces look quite interesting. The third picture looks like it shows some microvoid coalesence which is indicative of ductile failure so was likely to be the final section to fail. The first picture looks like there are some beach marks visible which typically point to fatigue. The holes through the centre of the crankset are interesting though as they seem to show a different fracture surface again. No idea whether thats because its actually a different material or whether the drilling process effectively heat treated or modified the material around the holes.

13
Component Deals & Selection / Re: ZRace RX crankset - broken
« on: October 25, 2023, 05:34:21 PM »
Quote from: Linsook on October 25, 2023, 02:30:12 PM
Need an expert to chime in.

Some closeups.

I wouldn't go as far as expert but I have a little bit of knowledge of this kind of things. If you could get some good close up photos of the two faces if you can get them apart that might be helpful. Make sure to indicate which side is the pedal side.

14
Road Bike Frames, Wheels & Components / Re: Velo Build R-099 Build
« on: September 13, 2023, 07:08:17 PM »
It wasn't because some seals were left stuck on the base of the crank arms? Sometimes there is a really low profile seal from a shimano BB install which gets stuck with grease to the crankarm/spindle. On the photo of the non-driveside crankarm it looks like it is sitting quite far out from the face of the bottom bracket.

15
Component Deals & Selection / Re: DT Swiss like aero hubs
« on: August 31, 2023, 12:25:38 AM »
Closest I have come across.

https://www.aliexpress.com/item/4000797761449.html?spm=a2g0o.store_pc_groupList.8148356.31.203159b0y9Pt0S&pdp_npi=3%40dis%21NZD%21NZ%24%20272.28%21NZ%24%20231.44%21%21%21%21%21%402101f49716934594234591931e8da1%2110000008039939537%21sh%21NZ%21784578575

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