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Discussion Starter #1
I'm slowly building a singlespeed from old parts I have laying around. I don't have a seatpost collar however and need to order one.

How do I figure out what size I need?

The post itself is 26.8mm, but I'm not sure how big the outside diameter of the frame is. I don't have any great tools for measuring. The frame is a '95 GT Backwoods (aluminum triple triangle design).
Any advice is much appreciated.
-D
 

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Paper, pencil, and elementary geometry are the only tools needed

Take a piece of paper and wrap it around the tube. Then mark with a pencil where it overlaps. Flatten the paper and measure the length.

Then using some elementary geometry: Circumerence= Pi X Dia or Dia = Cir / Pi

Take your length (cir) and divide it by Pi (3.1415) and you'll have the diameter.

If your measurement is in inches, multiply that my 25.4 and you'll have it in millimeters.
 

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Discussion Starter #3
thanks.

Almost too easy.
Thanks for the advice (and the math lesson).
No surprise that I never did well in math, huh?
Cheers,
D
 

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TriageNAM said:
why bust your brain over that, just ask someone who knows or take it to a local bike shop.
Bust your brain? Sheesh, what's our educational system creating.

Give a man a fish, and you feed him for a day, teach a man to fish and you feed him for life

It takes 2 min to measure and calculate the tube size.

dyurcik asked the question 5hrs ago. Still no responses from someone who knows about his 1995 bike.

How long does it take you to pack up your bike and haul it to the LBS?
Probably not 2 min.
 

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Discussion Starter #6
$$$

I give most of my spare $ to the LBS, but I'm trying to do this project solo. So I'm ordering parts online (the budget flavor that the LBS doesn't stock). A trip to my LBS isn't convenient for something like this. I can measure at home then order online from home without having to load the bike on the car.
Not a bad suggestion though. I head to the LBS everytime I can't do it on my own.
 

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dyurcik said:
I give most of my spare $ to the LBS, but I'm trying to do this project solo. So I'm ordering parts online (the budget flavor that the LBS doesn't stock). A trip to my LBS isn't convenient for something like this. I can measure at home then order online from home without having to load the bike on the car.
Not a bad suggestion though. I head to the LBS everytime I can't do it on my own.
Are you going for a quick release collar? If so, be careful with the budget ones. They don't usually hold real well. Which one are you looking at?

I just ordered a Salsa Fliplock. Wife said it came in the mail today. Gonna put it on tonight.
 

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Discussion Starter #8
not quick release

tlg said:
Are you going for a quick release collar? If so, be careful with the budget ones. They don't usually hold real well.
I don't think I'll be doing a quick release. This bike won't be doing any steep descents that I would want to drop the seat for. So probably just a plain-jane collar. Thanks for the tip though, I hadn't heard about the cheap ones slipping. That could get ugly on some of the full-sus frames out there.
 

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the guy said hes on a budget, Salsa stuff isnt cheap.... I have a Salsa QR clamp in a 30.9 sitting in the shop it retails $36.00 Notice I said sitting in the shop? Super nice but, hey i have never seen a clamp break to this day.

Spend all your money on salsa for eat for a day, Buy a cheap on thats works and eat for a week!
 

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TriageNAM said:
the guy said hes on a budget, Salsa stuff isnt cheap.... I have a Salsa QR clamp in a 30.9 sitting in the shop it retails $36.00 Notice I said sitting in the shop? Super nice but, hey i have never seen a clamp break to this day.
So? Most people are on a budget. I sure am. I just bought a Salsa for $19.95. And who said anything about a clamp breaking?

Spend all your money on salsa for eat for a day, Buy a cheap on thats works and eat for a week!
Confucius, what if the cheap one slips and then you have to buy a better one? Not good for the budget.
 

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TriageNAM said:
fine then...
A quick check of Cambria shows that they have the Salsa Lip-Lock (does Salsa make the IRD collars as well or are they both just brand names owned by QBP?) and DKG for well under $20. Either of those collars might be twice the price of some generic one you might find at an LBS, but the difference isn't much more than a junk food run to 7-Eleven.
 

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khj said:
A quick check of Cambria shows that they have the Salsa Lip-Lock (does Salsa make the IRD collars as well or are they both just brand names owned by QBP?) and DKG for well under $20. Either of those collars might be twice the price of some generic one you might find at an LBS, but the difference isn't much more than a junk food run to 7-Eleven.
IRD (Interloc Racing Design) is an independant company currently based out of South San Francisco. They've got a website at www.InterlocRacing.com if you want to check out their stuff.

Their Tail Fin QR collar and Stingray bolt-on collar are sweet indeed, and I can vouch for the Tail Fin's holding ability on my wife's Marin.

<img src="https://www.interlocracing.com/tailfinclamp.JPG">
 

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Speedub.Nate said:
IRD (Interloc Racing Design) is an independant company currently based out of South San Francisco. They've got a website at www.InterlocRacing.com if you want to check out their stuff.

Their Tail Fin QR collar and Stingray bolt-on collar are sweet indeed, and I can vouch for the Tail Fin's holding ability on my wife's Marin.

<img src="https://www.interlocracing.com/tailfinclamp.JPG">
Yeah, I looked up their web page and since QBP isn't their only distributor I pretty much guessed they weren't the Salsa collars with their logo etched on. It's just that Salsa's Lip-Lock and IRD's Stingray are functionally identical save for the decorative fin on the IRD collar. By the way, I've had a Lip-Lock on my bike for years without any problems.
 
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