SR Suntour
 

http://www.pedalconsumption.com/file..._crankset.html

http://www.pedalconsumption.com/file..._crankset1.jpg

4 bolt?

That does look a little weird, huh?

There's probably one under the arm. I've seen some cranks like that. Terrible design.

the 5th bolt probably threads into the back of the arm. a la campagnolo. record cranks have been like this for years with no ill effects that i know of. i hear its lighter and stiffer, what i do know is it looks nice.

http://bikeforums.net/attachment.php...hmentid=131494

Ritchey and Zipp(4 bolt)have that design also.

i think the late 90s early 2000 specialized cranks were this way too

edit: i lied, strongarms were standard 4 bolt :)

I'd have to assume there is a 5th bolt as otherwise it'd have to be an extremely bizarre proprietary ring design that wouldn't make a ton of sense. Having the bolt behind the arm is a bit of a pain in the ass but no big deal IMO

you dont need a proprietary ring...

the bolt is long and threads into the crank from the back and there is a spacer between the chainring and crank. its not rocket science, or new technology.

whats a pain about it? its just one chainring bolt that doesn't require a nut or any tool to hold it...

edit:

early campy cranks with the hidden bolt did have a "half spider arm" behind the crank and the nut was pressed into the large chainring. this did use a special chainring but you could use a standard chainring and nut if you wanted to. (ive done it)

You misunderstood me.

If this ring was a 4 bolt, and in the pattern pictured, it would be a proprietary ring, as that would make it different than the current 4 bolt pattern in use.

As for being a pain, I thought I recalled trying to get at the bolt of a regular chainring that happened to have the crank arm in the way before, however upon looking at the bike in question I was mistaken. It wasn't behind the crank arm at all, just a pain in the ass because the thickness of the crank arm at the spider made it awkward. For some reason I thought it was completely behind the crank arm.

oops, that i did. my apologies sir.

OK, but it still looks odd to me. It just feels like it's missing something.

it looks different, I guess that's enough.

or maybe its just the same

http://bikeforums.net/attachment.php...hmentid=131536
http://bikeforums.net/attachment.php...hmentid=131535
http://bikeforums.net/attachment.php...hmentid=131542
http://bikeforums.net/attachment.php...hmentid=131544
http://bikeforums.net/attachment.php...hmentid=131545
http://bikeforums.net/attachment.php...hmentid=131546

campy style
 

not missing, just hidden.

http://www.nexternal.com/icycles/images/recordbolt.jpg

I get that, but the look of it makes me feel like a gap has to be filled. I'm just being stupid

I want one for sure.

centering the chainring is a little harder using the hidden 5th crank arm like this. atleast it was when I converted my campi record crank arms to single ring and used a Miche primato 135bcd chainring.thats the only draw back I ever had with this design. i think it looks rad!

man those look sick! im looking for a new crankset too, might have to check these out.

They've been making these for road bikes for years as the Superbe and Superbe Comp. They do look quite nice, in a Campag Chorus-a-like way.

chorus had a traditional 5 arm spider until 10spd, record has been this style since 8spd, maybe longer...

i'm glad there are other fans!!

alloy
http://www.e-cycle.co.jp/goodsphoto/...ANK-06-450.jpg

well what do you know. my alloy chorus 10v cranks (and every one ive ever seen) has 5 spider arms.

either way, im pretty sure they started it with record 8v and chorus did not get it till later 10v

edit:
from what i can tell that crank was the 2006, the last year for square taper

4 bolt isn't exactly proprietary unless we are talking about 960 series shimano xtr. Despite the 960 xtr, all 4 bolt patterns are 104mm.

This thread is giving me a serious Campagnolo jones. Now to figure out how to get my hands on a group set and turn my conversion into some sort of fixed gear conversion that has freewheel capabilities and multiple gears.