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Re: Frame advice - hardtail with a 40T (or more) chainring
Quote from: Deem on February 11, 2025, 07:07:22 AM
I've just finished building a beachracer for beachracing with a 29er.  :)
- Frame: TanTan (Seraph) FM199 29ER*2.35Tire. Flared handlebar, seatpost and stem are also from TanTan.
- Control levers GRX ST-RX820 1x12s
- Flat mount brake calipersGRX RX820  (front Post Mount to Flat Mount adapter)
- Frontring 48t Narrow-wide (0 offset) with 10-45 (1x12speed) (https://www.themechanic-parts.com/)
- Rear derailleur GRX RX820 12s
- Crank XT 165mm
- Carbon rims: 40mm and 36mm (Elavo Carbon Ali) with Dt Swiss hubs and Sapim spokes (Spoke the carbon rims myself) 8)
- Tyres: 60mm Schwalbe G-One Speed Evolution 60-622 and VITTORIA Tattoo II 29x2.3
Please post some pictures of this rig.  it sounds amazing.  Also would love to see the clearance on the chainring.  this sounds like the best option so far for the "monster gravel" style build.
February 11, 2025, 06:45:01 PM 		1
Re: Looking for: Gravel bike big tyre clearance 60mm/2.35i Already made a post about my bike in the MTB-forum, but it's relevant here aswell.

Just like user "Deem" on the first page, I went the MTB-frame with drop bars route. Inspired by the beachracing scene here in The Netherlands and Belgium. But the bikes makes a great and fun gravel bike aswell ! Like others have said, it does require a mix and match of different standards to get the required results.

I went with the Airwolf YFM026, which has a stated max chainring of 40t. But I fitted a 42 already without issue, 44 might be possible aswell if you start playing with the offset. Then I got some Nextie rims that were built with MTB-boost hubs.
In summer I use 2.35" Thunder Burts and it makes for a super fast and fun gravel bike!

There is one brand that started dabbling into a gravel frame with 60+ mm clearance. It's a super small Dutch brand, but they bought their previous frames from Chinese manufacturers. I would love to know which manufacturer so we could buy it direct from them.
https://stormsports.nl/products/storm-makai-beachbike-gravelbike
March 05, 2025, 04:36:10 AM 		1
Hongfu FM358 build Well it’s a go, the frame is paid, just have to wait for a couple of months now.
I will be transferring most of everything from my hardtail onto this frame. Just ordered a rockshox SIDLuxe ultimate 3P in 210x50 for it and also looking for the matching SID SL 3P fork to match but I am ok to start with the SID SL I have now to start with.
The big unknown right now is the headset, need to research some more the options

Paint scheme as below, somewhat racing inspired (lotus, caterham…)
July 11, 2025, 03:31:08 PM 		1
Re: Hardtail mtb frame for XC and gravel Thank you for the recommendation Deem, Sounds like I owe Zeus an apology and need to reconsider my geometry preferences. That tantan FM199 you're happy with has a 69.5 degree head angle (when using a 496.3mm fork).
Doing some very basic maths, with the rule of thumb approach - 10mm A2C change = 0.5 Deg head angle difference I get around a 1 degree reduction from published with a 120mm suspension fork (Manitou R7) and approx 1.75deg increase in head angle when using an SP Cycle 471mm rigid fork. Either the Carbonada Zeus suggested or Deem's TanTan (Actually a little slacker than published due to the reference fork length) give a head angle around 68 degrees with an R7 and 70.8 with a rigid option. This seems a pretty reasonable switch between modes.
For reference, the SP Cycles M06 starts with a 67.9 HA which drops to 67 even with an R7, but only steepens to 69.7 with the rigid fork installed. This seems great for a hardtail, but maybe not quite steep enought for gravel racing?

48 tooth ring is too big for me, we've got hills and I'm no UCI WC level rider, aka, I'm not that strong. I think I'll start with a 38 and go up (or down) from there.

p.s. does anyone know how to insert a libreoffice spreadsheet table into a forum post?
October 19, 2025, 02:25:18 AM 		1
Re: How to get into wheelbuilding I laced my first wheel with a cheap spoke wrench and one youtube video. Trued the wheel while it was in the fork with zipties that was cut for a set distance. Used DTs spoke calculator. My LBS only charges 15€ for building wheels BUT they don't lace internal nipples and straight pull hubs.

I jumped into wheel building with the bare minimum and worked out. Currently have a pair of cheap plastic truing things and spoke tension meter on route.
October 29, 2025, 04:00:37 PM 		1
Re: XM Carbonspeed Ultra-Wide Gravel Wheelset with Titanium Spokes
Quote from: radrick_91 on December 06, 2025, 04:50:58 PM
Great build.

Are you satisfied? How do the wheels feel? Aren't 35mm tires almost too narrow?

Did my first ride today (~72km) and I'm really happy with the result. It's comfortable, has lots of grip and is feels quick.
But I don't have any data to back that up. I simply believe the latest research which shows that...
  • wider tires reduce rolling resistance
  • increasing comfort through greater air volume as suspension minimizes rider fatigue
And all of that without compromising performance.

The widths match quite nice according the 105%-rule (42mm outer rim width; 39.5mm tire width).

The Michelin Pro 5 tires have an unmounted tread width of 45mm, which is even more than the Pirelli P Zero 40-622 at 42mm. This means that even when stretched, the risk of running off the tread is reduced.


Regarding ETRTO compliance: I don't really like the concept of regulatory documents being behind a paywall. Additionally, it seems that bicycle tire standards are outdated and not up to current requirements. The complexity also exceeds that of car/motorcycle tire standards. While ETRTO is indeed a technical institution with regulatory purposes and its importance is highly regarded in various forums, threads, and Reddit discussions, this apparently doesn't tell the whole story.

This article provides valuable insights: https://www.cyclingweekly.com/products/will-the-adoption-of-tubeless-technology-finally-force-wheel-and-tyre-brands-to-get-friendly

The most prominent example of deviating from ETRTO standards is SRAM/Zipp. They allow a 40mm tire on their 303 XPLR wheels  (32mm inner width rim) through their 'dual testing' approach, far from ETRTO standards.
Quote
ISO Certified tire combinations are within ISO approved standards. These compatibilities are as reported by the respective tire manufacturers.
Dual Tested tire combinations have been tested by both the tire manufacturer and Zipp for compatibility.
Zipp limits the tire size compatibility on 303 XPLR wheels to tires between 40-60mm. Within this range, ISO tire and rim size guidelines allow any TSS-compatible tire sized from 58x622 up to 60x622 (29"×2.3"-2.35").
December 08, 2025, 03:34:55 PM 		1
Re: Hongfu FM358 build I received the bushing from offset and started the build last night:
December 13, 2025, 11:37:11 AM 		1
Re: Hongfu FM358 build To use a 160mm rotor on an MTB frame, you need an FM to PM 140mm adapter. This adapter provides zero offset.
December 18, 2025, 06:28:34 AM 		1
Re: Hongfu FM358 build First weight taken tonight at 10.3kg with nobby tires, heavy ass pedals, power meter but without the chain. I think i can probably get the weight at 10-10.1kg with summer XC tires which would be phenomenal I think!
December 18, 2025, 11:00:55 PM 		1
Re: Hongfu FM358 build A couple more things to do but getting close. Need to research more on dripper post, not pleased with how I did it, and rear shock to be cabled.
Also the alignment of the chainring is not good, needs to be moved inboard by 3mm I think to have it aligned with middle of cassette.
All front end will also need to come apart to add a 0.5mm spacer to eliminate rubbing and allow better headset compression…
December 20, 2025, 02:12:06 PM 		1