Final Questions - London Fixed-gear and Single-speed

eyebrows · 27th March 2008

As I don't know the spindle length of my cranks, but i know they're off a english BB on a square taper do I go for a 107 or a 109mm BB?

With reference to this chart:
http://www.businesscycles.com/tr-refspec.htm

fruitbat · 27th March 2008

Depends on your cranks
Campag single is 109, Mavic (or is it Miche) are 107.
My TA single needs 111.5 to get the chainline right

eyebrows · 27th March 2008

its a Dura Ace crank, but all the numbers have rubbed off.

|³|MA3K · 27th March 2008

eyebrows · 27th March 2008

thanks!

|³|MA3K · 27th March 2008

http://www.londonfgss.com/discussion...tabase/#Item_2

eyebrows · 27th March 2008

on that it says 109 alot....

fruitbat · 27th March 2008

Sheldon says: DA single should be 109

http://sheldonbrown.com/bbsize.html

eyebrows · 27th March 2008

this has confused me even more.
i thought it'd be a 109, but now i'm well confused.

|³|MA3K · 27th March 2008

Being retarded sorry: TWICE

Stronglight+UN53/107+Sys-X+Formula= MA3K
Dura Ace+UN53/107+Dura Ace+Dura Ace= MA3K
Sugino RD+Sugino/103+Sys-X+Dura Ace= MA3K

eyebrows · 27th March 2008

MA3K,
sorry for being a retard myself but where do you find 109 un53s?
I can only find 110s

eyebrows · 27th March 2008

anyone?

|³|MA3K · 27th March 2008

Woops, looks like I was wrong the first time. Just pulled out an old bb and it is 107.

Disnumeracy ahoy, shit that is embarrassing.

eyebrows · 27th March 2008

I am now utterly utterly lost.
Where does sheldon get these elusive 109s?

rusty · 27th March 2008

Are they hammerhead shark shaped 109s? ;)

eyebrows · 27th March 2008

yup.

Edit:
So I'm going to trust MA3K and order a 107mm un53.
English thread 68 mm

rusty · 27th March 2008

sugino might do 109s. A quick google shows that that's what the sugino 75 works with. It's not a cartidge bb though so I tink it'd not be weather proof.

asm · 27th March 2008

no go for 110, if back hub's chainline is 42 mm, this will make it closer than 107. duh!

(assuming that 109 gives you the optimum for a 42 mm chainline, 110 will put it 1 mil out whereas 107 will put it 2 out the other direction)

edmundane · 27th March 2008

for shimano UN BB's 110mm and 107mm have the same length on the drive side. the difference is on the left side. i have installed both and tried riding both i can verify that.

campag's or sugino's 109's are ISO taper, which if fitted with dura ace cranks you wont be able to tighten the cranks up properly.

verdict:
as far as i know MA3K's setup is perfect. right choice.

asm · 27th March 2008

what's the point in having a few extra mm on the left side? Not saying you're wrong ed, it's a little strange though...

edmundane · 28th March 2008

yeah, i don't get it either...

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27th March 2008	#1
eyebrows	As I don't know the spindle length of my cranks, but i know they're off a english BB on a square taper do I go for a 107 or a 109mm BB? With reference to this chart: http://www.businesscycles.com/tr-refspec.htm
	quote reply

27th March 2008	#2
fruitbat	Depends on your cranks Campag single is 109, Mavic (or is it Miche) are 107. My TA single needs 111.5 to get the chainline right
	quote reply

27th March 2008	#6
\|³\|MA3K	http://www.londonfgss.com/discussion...tabase/#Item_2
	quote reply

27th March 2008	#15
rusty	Are they hammerhead shark shaped 109s? ;)
	quote reply

27th March 2008	#19
edmundane	for shimano UN BB's 110mm and 107mm have the same length on the drive side. the difference is on the left side. i have installed both and tried riding both i can verify that. campag's or sugino's 109's are ISO taper, which if fitted with dura ace cranks you wont be able to tighten the cranks up properly. verdict: as far as i know MA3K's setup is perfect. right choice.
	quote reply

28th March 2008	#21
edmundane	yeah, i don't get it either...
	quote reply

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