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Messages - tisun

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1
29er / Re: MF05 - Light Cycling Lightweight hardtail
« on: September 07, 2026, 11:25:39 PM »
I've been dreaming about an ultra light Mondraker Podium RR SL for a while.  This frame is 100g heavier than Mondraker's, but at 1/4 the cost.  It might fulfill my dream then.  The question is, should I build it as a XC bike for local SoCal mtb races, or build it as a dropbar hardtail gravel bike for Belgian Waffle Race in San Diego.

2
29er / MF05 - Light Cycling Lightweight hardtail
« on: September 06, 2026, 10:06:31 PM »
I was browsing Light Cycling website to check out their new aero frame and found their new HT offer:

MF05: 850g for size S, 66 degree HTA

https://light-cycling.com/shop/carbon-mtb-frame/lightcycling-mtb-mf05/

The geometry matches 100% to the new SpCycle Super Light M038.  That means both Light Cycling and SpCycle are sourcing their HT frame from the same factory.  Cost + shipping is the same from both of them.  However, Light Cycling adds extra values:

- extra QA
- cleaning BB thread
- check caliper mount
- pre-installed internal guides
- sound dampening foam tubes

3
Road Bike Frames, Wheels & Components / Re: RPANTAHI Carbon Cranks
« on: September 02, 2026, 11:02:24 PM »
Also bought RPantahi and PP5 power meter.  Couldn’t make them to work so I replaced the PP5 pm with a Sigeyi one.  Put VMX 50/36 chainring on the crankset for lightweight benefit.  The whole setup is much lighter than SRAM Red crankset with PM.  Been riding it for the last 3 months, very happy with it.

4
Maintenance, Mechanics, & Tools / Spoke length calculator
« on: August 20, 2026, 05:05:49 PM »
Any recommendations for a reliable one?  I've tried https://spokecalc.io/ and https://bicyclecalculator.com.  Same rim specs, hub specs, they gave me different lengths haha.  Don't know which one I should use to buy spokes for my first DYI wheelset.

5
29er / Re: Spcycle Super Light 29er Hardtail MTB Frame M038
« on: August 18, 2026, 11:14:07 PM »
There's no free shipping to USA this time.

6
Maintenance, Mechanics, & Tools / Re: Bent chainring, is it common?
« on: August 10, 2026, 12:04:02 PM »
Thanks Jonathan.  The ThinkRider PM I bought from Amazon didn't come with a washer at all.  Luckily I have a Sigeyi PM available and use it with RPantahi crankset instead.

7
Component Deals & Selection / Re: ZTTO Gen3 cassette
« on: August 06, 2026, 06:37:09 PM »
Here it is, after 18 months, less than 1000 miles

8
29er / Re: Spcycle Super Light 29er Hardtail MTB Frame M038
« on: August 06, 2026, 03:13:34 PM »
I bought an spCycle M868 frame 2 months ago and got free shipping from AliExpress.

9
Component Deals & Selection / Re: ZTTO Gen3 cassette
« on: August 01, 2026, 10:56:48 PM »
My ZTTO XD freewheel cassette lasted 1.5 years, less than 1000 miles.

10
Bought a set of IIIPRO Peerage  ;D brakeset on AE.  Upon receiving, I tested the lever and found a leakage in one of them.  Contacted the seller and this is what they say:

Quote
08/01 15:21
你安装好使用就可以了,测试好发货的,重来没有漏油过,插入线的时候插到位置锁紧螺丝就好
Just install it and use it; it's been tested before shipping. There has never been any oil leakage. Just insert the cable into the correct position and tighten the screws

Haha. 

AE has accepted my return request though.

11
Where can we buy THR Industry hubs to build wheels ourselves?  Can't find them on AE.

First off--I don't own superlight wheels, though I have seen some of them in person, and ridden them

I want to be careful here as well, since a lot of this comes down to usage and preference, and I feel like Light Bicycle, Zen, DFS, and XMCS reps might call me out for these comments. It's my opinion that the H Works and similar hubs out there are not a higher-end product; they are more of a price-point product, and the ones designed to be lightweight are trading on stiffness and, ultimately, durability to achieve what they are doing. Rather than comparing these ultralight wheels to Roval or Enve, I feel like a more appropriate comparison would be to Extralite. What these companies have achieved is extraordinary--they have pushed the envelope for ultralight wheels and lead the market in that regard.

That said, you still need to take a step back and ask about the cost and if you were to make a wheel that was designed to stand up to race conditions, whether those are a cat 5 crit or a pro road race, if you would still design the same ultralight wheel. My observation about my wheels, which I believe are DFS XL rims on R3 Hubs, is that they are more flexible than I would like. Not in a way that is noticeable on the road, but clearly more flexible than my Roval or Ascent wheels. They did go out of true--something those wheels never do / did despite more mileage. Its my belief that for my use, the R2 hub would have been a better choice because of its geometry. With wheel stiffness resulting from multiple factors, including hub geometry, spoke count, and spoke type, it's generally hard to call out a specific property. However, between the R3 and R2 hubs, which have the same lacing pattern and spoke count, I believe I would have benefited from the R2 design's better bracing angle and more equal spoke tensions.

Compared to the 20/20 carbon spoke wheels I have seen, I believe my R3-based wheels are noticeably laterally stiffer, which would be going in the wrong direction, as I personally would prioritize stiffness and reliability over even 200g.

As for why I like the THR Industries Hubs, I think they are among the few (Chinese or not) that are comparable to the Enve Innerdrive, Vision PRS, and Roval Aero hubs in terms of helping build a high-performance wheel.

12
Thanks guys for your input. Looks like DFS is a good supplier for this project.  @CycOps, what is the estimated cost of your sub 1000g wheelset?

13
I wanna build a sub-1000g climbing wheelset.  Just checked out XMCS rims:  360g per rim of the lowest depth (36mm), 24 holes.  I believe I can talk to to Peter to customize them to 20 holes.  GoldiX hubs R180SL: 250g per set
Carbon spokes: 40 total, 3g per spoke, so 120g

With this configuration, components are easily sourced but total weight is over 1000g already.

How do they do it?

14
This has already happened to me with the Think Rider, because it has a wide locking ring and the spacer gets pinched at an angle, you need to use a spacer that fits inside the Think Rider.
In other words: the Think Rider must not be in direct contact with the bottom bracket, this is my experience.

This might be it.  What type of spacer should I get?  Could you take a photo of your spacer so that I can get an idea?  Should using a different lockring solve the issue?

15
Maintenance, Mechanics, & Tools / Bent chainring, is it common?
« on: June 20, 2026, 08:56:31 PM »
I just bought and installed Goldix chainring on my RPantahi crankset with Thinkrider powermeter.  However, the chainring isn’t spinning evenly.  I think they are bent.  Do you think it’s acceptable for such uneven chainring?  Is bent chainring a common issue with Goldix?

https://streamable.com/7pmrx4

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