Author Topic: Klaster_1's Hongfu FM079 build  (Read 3233 times)


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Klaster_1's Hongfu FM079 build
« on: November 04, 2016, 05:02:27 AM »
Crossposting from WW, I figured this info might be of use here too.

Quote from: Klaster1
First time (well, almost) poster here, took awhile before I've gathered enough courage to post one of my bikes here. It'a Hongfu FM-079, the build was started in 2014. Back then I didn't have any prior experience with road bikes and wanted something more suitable for pavement than an 26" XC hardtail. During June 2014 - March 2015 I've picked, bought and built everything together. Initially, the budget was about 2500USD+ with the following requirements:

  • Road specific carbon fibre disc frame. After some search, I've picked FM79. Not like there were much other options.
  • Shimano 11 speed hydraulic groupset. I wanted something modern and didn't might to become an early adopter. Compatibility with tools and MTB parts already owned played a big role too. Hydraulic shifter options were limited at the day to RS-785 and ST-RS685. Since ST-RS505 wasn't out yet and DI2 was out of budget, 785 became an only option with 5800 filling the rest.
  • Tubeless compatible clinchers, but not XC-tier shallow. Light-Bicycle laced to Novatec 711/712 proved to be a good choice, albeit on a heavy side.
Due to points above and general lack of expeience, the first version of build came to be about 8.1kg. Summer 2015 helped me to understand where to and how the bike might progress towards. I also got more disposable income to spend.

During 2016, I've progressively swapped most of easy gain parts to their lightweight counterparts.

Build list as of today:

Code: [Select]
Component Type               Component               Weight (Grams)      Note
Frame                        Hongfu FM-079           1040                Claimed weight, 56cm
Fork                         Hongfu HF-FK166         415                 Steerer cut, with crown race; 22.3mm internal diameter
Fork hose clamp              Hongfu                  3                   Two phillips screws and U-clamp
Headset bearings             Neco                    50                  educated guess
Headset cap                  Neco                    11                  5mm
Steerer spacer               Hongfu                  5                   1cm
Top cap                      MT ZOOM                 3                   Works with sunken expander only
Top cap bolt                 MT ZOOM                 2                 
Bars                         Hylix Ergonova          186                 44cm, uncut
Stem                         Kalloy Uno 7            94                  11cm, paint stripped
Stem bolts                   J&L                     12                  ti, black
Expander plug                J&L                     12                  Tuned, new brass bottom with longer shaft (+5g)
Bar tape                     Velo Gel Wrap           64                  cut
Seatpost (bare)              Hongfu                  105                 Cut off 80mm and 23g; 141 total
Seatpost cradle              Hongfu                  15                 
Seatpost bolt                                        3                   ti
Seatpost bolt                                        4                   ti
Seatpost yokes               J&L                     14                  M5, 7075
Seatpost clamp               MT ZOOM                 10                  34.9mm shimmed down to 32.3mm
Saddle                       Saevid Alien            78                 
Bar end plugs                SRAM                    4                   educated guess
Crankarms                    Zipp Vumaquad           442                 172.5; with rings; decals sanded down
Chainring big                Fibre-Lyte                                  50
Chainring small              Fibre-Lyte                                  34
Chainring bolts              Zipp                                       
Bottom bracket               Zipp                    72                  ceramic bearings
Front deraileur              Shimano FD-9000         65                  stock
Rear deraileur               Shimano RD-9000         161                 stock
Shifters                     Shimano ST-RS785        648               
Cassette+lockring            Shimano CS-5800         277                 11-28
Chain                        Shimano HG600           246                 cut down from 266
Pedals                       Xpedo R-Force Ti        166               
Brake calipers               Shimano BR-RS685        218                 109 per set
Brake pads+spring                                    42                  21 per set
Brake olives+barbs                                   14                  7 per set
Shifting cables                                      38                  uncut
Hydraulic hoses              Shimano                 52                  2700mm
Rims                         Light-Bicycle           870                 35mm U hookless, 2 total
Front hub                    Novatec D711SB          139                 408
Rear hub                     Novatec D712SB          269               
Skewers                      J&L                     30                  Bolt on
Spokes+nipples               Pillar PSR X-TRA1420    280                 56 total; 4 spares weight 20g
Front tire                   Schwalbe One Tubeless   370                 25mm, used & with sealant stuck
Rear tire                    Schwalbe Pro One        240                 25mm, new
Tire sealant                 Stan's NoTubes          50                  40ml per wheel
Bottle cage                  TUNE Wassertr├Ąger 2.0   9                   750ml bottle
Bottle cage bolts            TUNE Wassertr├Ąger 2.0   2                 
Rim tape                     Stan's Yellow Tape      12                  6 per wheel
Valve stems                  Gredes                  20                  60mm, 10 per set
Front rotor                  KCNC Razor              61                  140mm
Rear rotor                   KCNC Razor              62                  140mm
Rotor bolts                  J&L                     15                  ti
Computer sensor              Cateye Strada Slim      13                 
Computer head unit+clamp     Cateye Strada Slim      16                 
Caliper bolts                J&L                     12                  ti
                           Total                     7041               

Unfortunately, I didn't weight the frame, headset and housings, so those are listed with claimed values or a rough estimate. To my surprise, scales show exactly 7.00kg, a respectable disc bike weight in my book.

Since the winter is at door, the bike's going to serve as wall decoration until April. I plan to drop the weight down to about 6.8kg mark with these:

  • Schwalbe Pro One in the front, about 70g less than One Tubeless. Already own it.
  • XG-1190, still not sure if 11-26 or 11-28, -100-110g.
  • PC Red-22 chain, -10-15g.
  • Minor derailleurs tuning. J&L inner cage, carbon pulleys, nylon limit bolts and FD clamp bolt will save about 10g.
  • Bar tape, current one is way too porky, but it was the only thing I could source locally fast. I'd be glad to drop 10g here.
Obviously, there are more substantial gains, but prices skyrocket fast.
  • Frameset. 250g+ saving can't be made with open mold products of today. Big brands will cost at least 1500USD. New frame also requires thru axle hubs and flat mount calipers.
  • ST-R9120 shifters are 150g lighter, but cost about 1000EUR at the moment. Not an option unless price drops at least twice, which isn't going to happen until used units become readily available in several years. Works only with FD-9100 too, so add a new derailleur cost.
  • Wheels. Tons of options here. I'd replace Novatecs with Cyber hubs SPD-2 for ~200g saving, but those are not available in 28 holes. All open mold rims weight about the same and I'm not going shallower. 77 Compistes go for 1000EUR apiece, way out of budget. And as a casual rider I'm very hesitant of tubulars. Potentially, there's about 500g to save with top of the line clinchers for 2800EUR.
  • Seat/seatpost combo. At least 100g to lose here for a reasonable 400EUR. Still, I will have to be 100% sure about fitting, which I'm not.
  • Marginal 10-30g savings everywhere for hunders of EUR. Worth a shot if it's the cheapest option to reach 6.8kg.
All in all, I think 6.0kg is possible, but would cost 4000EUR or more and I'm not willing to go down that road.

Oh, and I don't race or go for really long rides, but riding experience has been great so far. There were some annoying moments, though:
  • FM079 has clearance issue with FD-9000 design. The smaller small chainring becomes, the more evident it is. Making 34 shift acceptably was harder than 36, but then again, I don't do that often. Other people already wrote about this several times.
  • Overbuilt fork. The steerer tube has quite small internal diameter, I had to heavily modify J&L UltraStar 2 clone so it would fit in.
  • Seat tube diameters are off. I suspect that inner diameter is less than it should have been, since stock seatpost measures 27.0mm and fits just great. Outside diameter is 32.3mm, which limits clamp design. Stock clamp with rotating nut works fine, but is way heavy at 25g. MTZOOM 31.8 collar, on the other hand, didn't allow to screw the bolt in due to messed up angle. I had to use 34.9 collar and a shim.
  • Frontmost seatpost yokes had to be cut at angle a bit due to interference with Saevid Alien bottom edge.
  • New frame had defects missed by quality control. One of the post mount holes wasn't completely threaded, so I had to ask friend with tools to help. The other issue was with one of bolt holes in seatpost head, I had to sand a drop of resin inside one bolt hole in order to put it in.
Looking back, I'd advice against purchase of FM079 or it's updated version. There are products that offer both lesser weight, flat caliper mounts, 12mm through axle support and no front derailleur clearence issues.


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Re: Klaster_1's Hongfu FM079 build
« Reply #1 on: November 10, 2016, 06:30:48 PM »
Awesome!  Great looking bike!  May I ask why you decided on hydraulic vs mechanical disc?  From what I've heard, the new TRP Spyres are pretty good. 


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Re: Klaster_1's Hongfu FM079 build
« Reply #2 on: November 11, 2016, 08:24:52 AM »
May I ask why you decided on hydraulic vs mechanical disc?  From what I've heard, the new TRP Spyres are pretty good.
Sure, Spyre or Juin would be good as well, but I wanted something I had expeience with, since my MTB has BR-M615. Tools and spares I already own played a part too.


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Re: Klaster_1's Hongfu FM079 build
« Reply #3 on: December 20, 2016, 10:40:44 AM »
What alternative disc road frames would you recommend?