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I just picked up a Kona Humuhumu-kunukunu-apu'a
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us56456712 said:
Cold rolled steel bar won't bend. Order online or from your local metal shop. Hot rolled like from the hardware store will bend.
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There isn't any real difference in strength between hot-rolled and cold-rolled steel, if the same alloy/grade. The difference in strength is that you are getting mild steel from the hardware store, and something stronger from the metal shop. The best reason to get cold-rolled for a seatpost is that it is more dimensionally accurate than hot-rolled.

Jason
 
RustyGold said:
There isn't any real difference in strength between hot-rolled and cold-rolled steel, if the same alloy/grade. The difference in strength is that you are getting mild steel from the hardware store, and something stronger from the metal shop. The best reason to get cold-rolled for a seatpost is that it is more dimensionally accurate than hot-rolled.

Jason
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Cold rolled is stronger stronger
 
Schwinn Heavy Duti. Hayes mechanical disc on unknown 1 ⅛" fork. Unknown, but seamless, bars and MacNeil stem. Profile chainring, unknown cranks, Conti 2.40" tires, Araya rims with Shimano hubs front and rear. The coaster brake rear is trashed after 22miles of mostly downhill mountain biking...but still rolls pretty free.

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us56456712 said:
Cold rolled is stronger stronger
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You are correct...I parrotted a rule of thumb that wasn't entirely accurate. Although tensile strength ranges from marginally to significantly better with cold rolled...yield strength is always significantly higher with cold rolled, which would be more important for a seat post.

With very few exceptions... a chromoly grade is is going to be the better choice than hot/cold/as drawn mild steel.

Jason
 
RustyGold said:
Schwinn Heavy Duti. Hayes mechanical disc on unknown 1 ⅛" fork. Unknown, but seamless, bars and MacNeil stem. Profile chainring, unknown cranks, Conti 2.40" tires, Araya rims with Shimano hubs front and rear. The coaster brake rear is trashed after 22miles of mostly downhill mountain biking...but still rolls pretty free.

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You are correct...I parrotted a rule of thumb that wasn't entirely accurate. Although tensile strength ranges from marginally to significantly better with cold rolled...yield strength is always significantly higher with cold rolled, which would be more important for a seat post.

With very few exceptions... a chromoly grade is is going to be the better choice than hot/cold/as drawn mild steel.

Jason
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I'm light, 155 pounds but I always bend hot rolled 5/8 bars. Cold rolled has never failed me. Also, Allen Bonds site "clunkers" has a tip page for building klunkers and he recommends a certain grade of aluminium rod. I can't recall what it is but I use that also without bending. I have only used it in 5/8 so it should be good on larger diameter for bigger riders.
 
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RustyGold said:
Is that Transition bracketed by a Hank and a Fisher? I'm in awe :43:

Jason
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Yes! Lot of mods on the Hank- but I have all stock parts boxed up. It was nos when I got it about a year ago. I like riding it best of all of them. I mean of the non vintage bikes. I have 2 Transitions actually.
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Chuy said:
What’s you rig geared at? Is that a oval ring?


Sent from my iPhone using Tapatalk
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Not an oval. I have a 34, 36, and a 40 for this bike. I change out as mood/riding condition dictates. I live in Colorado so I have many different choices of great riding right out my back door.
 

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