Hongfu FM079

Who are you (no off-topic talk please)

Moderator: Moderator Team

Post Reply
User avatar
Klaster_1
Posts: 653
Joined: Mon Aug 15, 2016 10:25 am
Location: Krasnoyarsk, Russia

by Klaster_1

Since all 1x parts - except for chainring - were delivered, I decided to put a stock 39t chainring on, with 34t as inner spacer. Too bad I didn't know regular bolts are not compatible with Zipp chainrings! Even worse, I did not get any Zipp bolts when I bought the crankset 😅 Now I'll have to wait several weeks more, at least that's plenty to explore ST-R9170 tuning options.

User avatar
Klaster_1
Posts: 653
Joined: Mon Aug 15, 2016 10:25 am
Location: Krasnoyarsk, Russia

by Klaster_1

Extralite UltraSpacer in 5mm and 15mm saves 4.24g compared to 4x5mm FSA polycarbonate spacers.
Attachments
IMG_20190601_173633.jpg
Extralite UltraSpacer 15mm weight
IMG_20190601_173624.jpg
Extralite UltraSpacer 5mm weight

by Weenie


User avatar
Klaster_1
Posts: 653
Joined: Mon Aug 15, 2016 10:25 am
Location: Krasnoyarsk, Russia

by Klaster_1

The round rails on my Lupina have have snapped. I read about this, but though the same wouldn't happen to me.
Attachments
IMG_20190612_161438.jpg

User avatar
mendiz
Posts: 76
Joined: Sat Aug 20, 2005 3:08 am

by mendiz

Try AX, for me the best saddles
Klaster_1 wrote:
Wed Jun 12, 2019 11:04 am
The round rails on my Lupina have have snapped. I read about this, but though the same wouldn't happen to me.
You don´t stop riding when you get old, you get old when you stop riding.

User avatar
Calnago
Posts: 7944
Joined: Sun Nov 07, 2010 9:14 pm

by Calnago

Image
I think the saddle clamp is as much to blame as the rails. Look how those “cables” are pulling down on top of the rails well behind the lower edge (stress riser) of the clamp. It’s like a lever effect, same as if you wanted to break a rod of some sort... plate it on a sharp edged fulcrum and push down, not directly above the lower clamp, but away from it to give some leverage on it. With nothing even supporting it from directly above the clamp, I don’t think it’s hard to see how that just is not a very good design.
Colnago C64 - The Naked Build; Colnago C60 - PR99; Trek Koppenberg - Where Emonda and Domane Meet;
Unlinked Builds (searchable): Colnago C59 - 5 Years Later; Trek Emonda SL Campagnolo SR; Special Colnago EPQ

User avatar
DOUG
Posts: 259
Joined: Thu Mar 31, 2016 9:54 pm

by DOUG

Its 2 poorly designed products that have been used together to produce the expected result. The round carbon rails were never going to be a good idea, I'm only 62kg running a proper clamp (C'dale seatpost) and still broke them. The oval rails Berk uses are rock solid but the round ones were an experiment that was destined to fail. This deinitely belongs in the WW that went to far thread!

User avatar
Klaster_1
Posts: 653
Joined: Mon Aug 15, 2016 10:25 am
Location: Krasnoyarsk, Russia

by Klaster_1

Thanks for your opinion, guys. Next time I'll try an oval railed saddle, probably another Lupina. For now, I'll put the Alien on.

User avatar
mendiz
Posts: 76
Joined: Sat Aug 20, 2005 3:08 am

by mendiz

Try Ax Endurance, for me is the best saddle
You don´t stop riding when you get old, you get old when you stop riding.

User avatar
Klaster_1
Posts: 653
Joined: Mon Aug 15, 2016 10:25 am
Location: Krasnoyarsk, Russia

by Klaster_1

Last week my front Tubolito was punctured by a small fragment of wire, I repaired it with Tubolito Flixkit, rode once and now the tube doesn't hold air. I'll try to patch the same place again since I couldn't find any leaks by either submersion or soapy water. When pumped over 10psi out of tire, the tube flips over so stem is on outer surface, I dared not to add more air. If another patch doesn't help, I have a pair of Tubolito Road S-tubo on the way, but that will have to wait two weeks while I'm on a business trip. Bad timing.

Meanwhile, I installed most of 1x kit - except for ST-R9170 - and removed some FD parts from frame. Too bad I didn't know black 3T Bailout exists! With 1x, the bike looks leaner, probably due to more down tube exposed and a smaller chainring.

Saevid Alien from my MTB (didn't ride since April :lol: ) is on, the setback seems ~1cm less compared to Lupina. If possible, I'll try to arrange a replacement Lupina with oval rails, but Jure has not replied yet to my email.

In my 1x spreadsheet I forgot to count for 50t chainring and was pleasantly surprised for a 50g freebie saving, especially after having to put a heavier saddle on. I expect to drop ~190g from 1x conversion, ~40g with S-Tubos and ~4g from hollow J&L rotor Ti bolts, with target weight of 5476g according to the spreadsheet. Afterwards, I can drop ~60g with Clavicula without sacrificing the function. Afterwards, only questionable ways to lose significant amount of weight would remain: shallow tubulars, MTB levers with friction shifter and Aerloite-style pedals, but I believe sub-5kg should be possible.
Attachments
IMG_20190615_125527_HDR.jpg
Hongfu FM079 with 1x drivetrain
IMG_20190615_115511.jpg
Hongfu FM079 FD down tube cable housing stop weight
IMG_20190615_114519.jpg
Saevid Alien weight
IMG_20190615_110832.jpg
PYC SP1101 chain, 104 links weight
IMG_20190613_221152.jpg
Hongfu FM079 FD hanger with bolts weight
IMG_20190613_201843.jpg
3T Bailout with XDR spacer weight
IMG_20190613_183434.jpg
Extralite road XDR driver, ceramic bearings
IMG_20190613_154208.jpg
Fibrelyte CF chainring tabs weight, 4 pcs
IMG_20190613_154143.jpg
Fibrelyte 1x lightweight 2 chainring 38t for Vumaquad weight

User avatar
godzuki26
Posts: 1045
Joined: Sat Jul 28, 2012 11:31 pm

by godzuki26

I think you should keep the Vumaquad. It looks so much cleaner and nicer. If you put the Clavicula on there you will push your Qfactor wider if that is something you don't mind.

It is too bad about your Berk saddle rails cracking. Berk has excellent customer service as Jure takes pride in servicing the customer. Don't waste your time with Darimo. Their customer service is absolute rubbish. I too agree with Calnago and blame the design of the Dyneema rope being the culprit in the failure of your rails.
:arrow: BH Ultralight
:arrow: Litespeed Ghisallo
:arrow: Scott Addict Singlespeed
_________________

ImageCannondale Evo HiMod
ImageFelt AR FRD

Post Reply