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Anyone using a 46/30T crank on a road bike?

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Anyone using a 46/30T crank on a road bike?

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Old 10-08-18, 06:25 AM
  #351  
tomtomtom123
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Originally Posted by Winfried View Post
On a Brompton folding bike, I currently use the following setup:
  • Bottom-bracket: JIS square taper Shimano BB-UN55 68x118mm
  • Crankset: Stronglight Impact 46/34 BCD 110 mm
  • Derailleur: Shimano Tiagra
Since the 46/30T FSA Tempo isn't available with 170mm cranks and the options mentioned above are a bit pricey, I was wondering if it'd be possible to…
1. Get a 50/40/30 triple chainset
2. Remove the 50
3. Replace the 40 with a 46
?

Are there middle 46T chairings, and do you think the whole thing will be narrow enough to fit on a Brompton?

Thank you.
The FSA tempo here only comes in 170 and 175 so perhaps your location just doesn't have them in stock. The specs say that the qfactor is around 148, while the spa cycle cranks are around 165 if you're using the triple as a double. The problem I have with the 30t on the FSA is that it's 80bcd and there are no other chainrings available. I was thinking about using a CNC machine to drill new holes on a 74bcd chainring which is limited to 26t with the 80bcd. But I ended up getting a 110/74 double.
46t middle can be found from ta zephyr, spa cycles, and sugino pe110. I have the 46t from spa cycle and it shifts really well with a 26t, but it came a little bent and bowed so I had to take a wrench and bend it back.
I might go down to 44/24
with My 20x2.10 tires and 30/11 cassette, and 46/26, I'm getting 83-17gi. With a 16 rim the equivalent inner chainring would be 30t.
i might drop the 30t cog to 32t but I'm not sure if there would be enough ground clearance for the rear derailleur for your Brompton. I have about 45mm ground clearance with the Shimano 4700gs. The sram mid cage is maybe 10-15mm shorter.

Last edited by tomtomtom123; 10-08-18 at 06:48 AM.
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Old 11-15-18, 10:15 AM
  #352  
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Subcompact and power meters

its even harder still to find a subcompact (<50/<34) crank that is power meter capable.
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Old 11-15-18, 10:20 AM
  #353  
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Originally Posted by Fr0hickey View Post
its even harder still to find a subcompact (<50/<34) crank that is power meter capable.
Yea, in that scenario your only choice is FSA.

https://www.clevertraining.com/stage...fsa-sl-k-light
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Old 11-16-18, 06:28 PM
  #354  
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Stages power meter with FSA SL-K is left-side only.
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Old 11-21-18, 11:20 PM
  #355  
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I found a local shop with a couple of Sugino ox-601d for much cheaper than soma fab. I'm going tomorrow to pick one up. Is anyone interested in another?
It comes with large sized 110 bcd chainrings, so you'll most likely have to use your own. TA Zephyr and Zelito chainrings, or Spa Cycles, has the widest selection. I was also able to get up to 20T jump with a chain catcher and some of fiddling with the FD.

I had a look at the Sugino website, and they discontinued the ox-901d too. Instead they've now got the ox2-901d which has serrated splines like the Shimano hollowtech 2 splines, which I believe makes a tighter fit and is more stable, but costs $400. The large, tall OX splines creates gap. I have about 0.1mm all the way around. This caused the left arm to gradually slip out, but I fixed this by adding lightweight loctite 222 on the compression bolt. I was thinking of getting another one because, I had a 165mm but I feel like my cadence is too fast, so I'm going to go back to 170mm.

I was also able to adjust the ox-601d chainline by 0.5-1.0mm by using Shimano mountain BB (with shaved road sleeve) and a spacer on the drive side. Shimano mountain BB overall width on 68mm BSA is around 0.7mm narrower than the overall width of the Sugino BB that comes with the crankset. The Shimano road BB is around +2mm overwall wider than the Shimano mountain BB, so you shouldn't use the road BB on the Sugino crank, otherwise you'd shorten the spindle by around 1.3mm. Original chainline is closer to approx. 44mm. Gap between chainrings is around 7.3-7.5mm. Q-factor to the most outer surface (not the countersink for pedal washers) is around 148mm.

Last edited by tomtomtom123; 11-21-18 at 11:24 PM.
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Old 11-26-18, 09:27 AM
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If anyone is interested I have one extra Sugino OX-601D, 170mm length, 52/36T, with Sugino BB, new in box and packaging. PM me if interested. I also have a new Sugino PE110S 46T chainring that came off my OX crank, which has countersinks on both sides of bolt hole so it can mount either middle or outer (of a triple, or the outer of the OX). And the new original 30T 74BCD that came together with that. And a minimally used 28T. I decided to go with 24/44T.

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Old 12-24-18, 01:28 PM
  #357  
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I had an FSA SL-K Adventure crank installed last year 46/30. The non drive side crank arm fell off after 100 miles and the crank was replaced under warranty. I was never really happy with the crank (it seem as though there was always a squeak from loose chainrings, bottom bracket or or crank arms).

Last week I had the crank removed and put the original Ultegra crank installed with a Wheels Mfg bottom bracket and absoluteBLACK oval chainrings 48/32. So far, the ride is amazing.
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Old 12-31-18, 07:37 PM
  #358  
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I’m going with an FSA Vero 50/34. This will be a nice hillclimber over the 53/39 I’m used to. Currently running a 7sp 12-28 cassette on the back. I’ll keep the road double and chain set aside. With these brutal hills around here, this will be an especially interesting spring with the Criterium Series.
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Old 12-31-18, 09:00 PM
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Originally Posted by Planemaker View Post
I had an FSA SL-K Adventure crank installed last year 46/30. The non drive side crank arm fell off after 100 miles and the crank was replaced under warranty. I was never really happy with the crank (it seem as though there was always a squeak from loose chainrings, bottom bracket or or crank arms).

Last week I had the crank removed and put the original Ultegra crank installed with a Wheels Mfg bottom bracket and absoluteBLACK oval chainrings 48/32. So far, the ride is amazing.

Sucky luck. My SLK is still in service, although my big-dog ring is showing some wear and is about due for replacement with only 5k+ miles....which for semi-offroad may or may not be a good life.
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Old 12-31-18, 09:04 PM
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My White Industries crank has been fine. I was worried about "regressing" to square-taper (the 30mm one didn't fit), but it has been robust and shifts as good as the Ultegra crank it replaced. (Di2)
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Old 01-01-19, 11:47 AM
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Originally Posted by Marcus_Ti View Post
Sucky luck. My SLK is still in service, although my big-dog ring is showing some wear and is about due for replacement with only 5k+ miles....which for semi-offroad may or may not be a good life.
It's all good. I actually like the Ultegra crankset better.

I will sell the the FSA crank
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