New Retro-style Cranks
03-20-15, 07:40 AM
#1
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New Retro-style Cranks
Enduro Bearings start shipping TorqTite threaded PF bottom brackets, plus prototype?cranks?
with external bearings
This is very cool. Built up on a bike with Electra Ticino sheriff's star hubs, TRP gum hood levers, etc. Could be very cool.
But DAMN expensive at $800!
with external bearings
This is very cool. Built up on a bike with Electra Ticino sheriff's star hubs, TRP gum hood levers, etc. Could be very cool.
But DAMN expensive at $800!
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03-20-15, 08:33 AM
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Let's see the bike!
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Commence to jigglin’ huh?!?!
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Commence to jigglin’ huh?!?!
"But hey, always love to hear from opinionated amateurs." -says some guy to Mr. Marshall.
03-20-15, 08:43 AM
#3
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^^Sorry, I meant it would go nicely on a bike built up with other modern retro bits.
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03-20-15, 09:16 AM
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03-20-15, 09:27 AM
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That does look pretty, but also pretty darned expensive. The article also says that it's machined, suggesting that it is not cold forged and therefore likely to be flexier than forged cranks.
03-21-15, 01:28 PM
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I'll bet it is stiffer than the original Super Record because of the beefier arms, and much stiffer BB. But it is probably not even close to modern external bearing BB / cranks.
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03-21-15, 01:44 PM
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03-21-15, 03:35 PM
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So it's the cold-forged arms that can be, and usually are, slimmed down for a lower weight, and that are thus going to be inherently flexier.
These ones have the look of 1990's billet crankarms, which while often made from higher-grade forged billet than cast arms, may not realize the optimization of grain orientation that forged crankarms can achieve.
Does the new bottom bracket utilize a square taper interface or some new splined interface on one or both sides(???).
I'd want to see evidence of a solid record based on at least a year of professional race testing before plunking down that sort of dough.
03-22-15, 10:07 AM
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Just like steel, stiffness (Young's Modulus, AKA Modulus of Elasticity) of aluminum does not vary with heat treatment or forging. Different alloy composition can have a barely measurable, but insignificant, affect on stiffness. Yield strength and fatigue resistance can be greatly improved, but not stiffness.
03-22-15, 11:45 AM
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sugino 75 dd is also the new classic external bearing option, can't find a good photo as of yet
edit: found some decent shots!
edit: found some decent shots!
Last edited by ezln64; 03-22-15 at 12:03 PM.
03-22-15, 12:03 PM
#13
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Apparently the Street fixie market has Money to spend, or that is the assumption ..
I doubt there are a Lot of Velodromes Being Built. other than 1 every 4 years for another Olympics
I doubt there are a Lot of Velodromes Being Built. other than 1 every 4 years for another Olympics
Last edited by fietsbob; 03-22-15 at 12:11 PM.
03-22-15, 04:12 PM
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I saw those cranks at NAHBS. Very flashy, and nice to see such an homage to Campy cranks. They are a bit chunkier than the Campy cranks, due to the the fact that they are CNC'ed instead of forged.
It's not obvious, but there is a bit of "dish" to the spider. The outboard bearing requires that the crank arm sit further outboard than on the vintage Campy, so the spider arms are angled a bit inward to maintain the right chainline.
I was intrigued by the fact that the web between the arm and spider that was prone to cracking on the vintage Campy crank exists on this modern interpretation. I asked if they were planning to file out the web to avoid cracks.
It's not obvious, but there is a bit of "dish" to the spider. The outboard bearing requires that the crank arm sit further outboard than on the vintage Campy, so the spider arms are angled a bit inward to maintain the right chainline.
I was intrigued by the fact that the web between the arm and spider that was prone to cracking on the vintage Campy crank exists on this modern interpretation. I asked if they were planning to file out the web to avoid cracks.
03-22-15, 05:59 PM
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03-23-15, 06:08 AM
#16
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Sorry, I thought that was obvious that these have external bearings. I realize how my post may have been a little unclear. I meant that these are likely not as stiff (especially in the spider) as even entry-level modern external-bearing cranks like 105, Athena, Apex....
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