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My Farley Build

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My Farley Build

Old 09-30-22, 04:11 PM
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UnCruel 
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My Farley Build

I thought I was done with the fatbike experiment. For about fifteen months, I had a Mongoose Dolomite ALX. It didn't turn out to be as much fun on the beach as I had hoped. However, it was a monster in snow/slush/ice, especially with the studded Dillinger 5s I put on it. Still, it was exhausting to pedal: I put in as much work to go 8 mph on flat pavement as I did to go twice that fast on my other bikes. The low quality components (microSHIFT groupset, mechanical disc brakes) were also a bummer. Overall, I wasn't enjoying it, so I got rid of it (donated it, actually).

However, I couldn't stop thinking about a bike for snow. Specifically commuting in snow, slush, and ice. I was thinking about some MTB with studded tires. I made the mistake of talking about this at my LBS, and to make a long story short, they convinced me that a fatbike was the way to go, and that the Trek Farley was going to have much better geometry than the ALX, and with decent components, I would love it a whole lot more. I hope they're right, because I placed an order for a frameset. It came in today.

This is going to be my first time building a bicycle. I have rebuilt a couple of bikes before, but this will be my first time working out all the correct components. I expect to learn much in the process, and I hope I don't make too many mistakes along the way. I've already started asking questions.
  • I'm thinking carbon rims. The bike accepts 27.5" wheels, but I still have the 26" Dillingers, which I like, so I think I'm going to stick with that. (I'm a small guy, and the frame is a size S, so it should be a good match.) I haven't decided on which rims. I think I want the width to be around 80-85mm (external).
  • I'm thinking SRAM NX Eagle 11-50t drivetrain with a 32t chainring. I'm fairly happy with this on my Giant Trance X 2. Trek builds the Farley 5 with a 28t chainring and the higher end Farleys with a 30t chainring, but this seems unnecessarily low for commuting. According to Trek, 32t is the max chainring size, unless I want to go to a 2x, which I don't.
  • Probably 165mm crank arms. Short legs.
  • Probably 720mm or 750mm handlebar.
I'll keep y'all posted as I go along, so you can see how the newbies do it.

(Also, my pocketbook is moaning about my evident addiction. I won't be buying all the parts tomorrow.)


2022 Trek Farley AL Frameset
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Old 09-30-22, 04:55 PM
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I run a 9-46t with a 30t CR. 27.5 wheels on my Farley. That maxes out the range on a Shimano XT which is where I like it. Without doing some ciphering not sure how my gearing compares with a different wheel size. My range suits my needs which is 99% off road. So with nothing in common enjoy this useless information.

27.5 wheels fit that frame very well. If you get 26ers you will wish you went bigger. 80/85 wheel sounds good for a 4" plus wide tire. I would think the wider the wheel the more prone to rock damage. Less tire to protect it. Selling off your old tires should cover half the cost of a new pair of 27.5s. WTH, it's not my money.

Beach sand that has had heave traffic can be tough to ride in even with super low tire pressure. Trackless sand can be a lot of fun. That Farley build will be less than half the weigh of the Mongoose. The Farley will be different experience. It's going to be awesome.
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Old 10-11-22, 02:51 PM
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Beautiful area! Where is it?

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Old 10-12-22, 08:44 PM
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^^^It's here Coral Pink Sand Dunes UT
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Old 10-27-22, 12:11 PM
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Originally Posted by Airfehr View Post
27.5 wheels fit that frame very well. If you get 26ers you will wish you went bigger. 80/85 wheel sounds good for a 4" plus wide tire. I would think the wider the wheel the more prone to rock damage. Less tire to protect it. Selling off your old tires should cover half the cost of a new pair of 27.5s.
Thanks. You got me thinking about it, and after some research and opinion polling, I decided to go the 27.5" route.

I've added/ordered:
  • Bontrager Kovee Elite 35 MTB Handlebar, 720mm and Kovee Pro 35 Stem, 13° × 50mm
  • Bontrager Rapid Drive front and rear hubs (with a Shimano freehub to go with the SRAM NX drivetrain I'll be using)
  • Nextie Wild Dragon (Premium Lite) 27.5" rims, 85mm external width
  • 45NRTH Dillinger 5 tires, 27.5" x 4.5", 120 TPI
I'll have to figure out spokes and stuff next.
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Old 11-21-22, 04:02 PM
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The rims arrived today (3½ weeks after ordering), and I've had the hubs for a while. Time to get serious about wheel building. I need to make measurements on the rims (just in case the published specs are wrong), and then order spokes and nipples.

I also need to learn about rim tape, choose something, and order it. Planning to go tubeless, of course.

Latest ETA on the tires, which are back-ordered, is December 10.

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Old 11-21-22, 07:31 PM
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Fatbiking is generally a low speed, higher resistance affair. I run a 28 chainring with 12spd XT and would not want to go any bigger up front than that. I did try a 32 for a gravel riding experiment and quickly did away with that.
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Old 11-22-22, 04:58 PM
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I'm having trouble finding any crankset that meets my requirements: 76.5mm chainline, 165mm crank arms, 32t chainring.
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Old 11-23-22, 01:55 PM
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Originally Posted by pipeliner View Post
I run a 28 chainring with 12spd XT and would not want to go any bigger up front than that. I did try a 32 for a gravel riding experiment and quickly did away with that.
Whoa. I was looking at 32t because that's what I have on my trail bike, and I like it. I wanted to go with the same drive train on this bike. My trail bike also has 27.5" wheels, but 2.6" tires. I knew the outer diameter/circumference of the tire increased with width, but I didn't look up the difference until now. It's much more drastic than I realized, a 13.5% increase, in fact. To counteract that, a corresponding decrease in chainring is called for, which would be 28t (28.2 rounded down).
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Old 11-24-22, 09:40 AM
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Yeah, with a modern 12spd drivetrain, a 30 or 32t is probably the choice of elite riders in the Leadville winter race series... not so much for recreational riders.
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