can someone post a pic of there rush frame equip with surgino crank and surgino BB. I have a huge gap between BB shell and inside of the crank arms,looks weird :=/

maybe you could post a pic here of your set-up. otherwise, it is like over-the-phone self brain surgery.

Dr 165,

can you do the surgery over the net?

S/F,
CEYA!

perhaps not, but I think visually...smartA55!
HA HA

Well somebody had to say it..

LOL
S/F,
CEYA!

i was trying to use a un73 shimano bb with a surgino crank,the sq taperd spindal is slightly diff from the surgino 75 bb, which i decided to use, no ugly gap now!, there not compatible.......

Was the UN73 the same length at the Sugino BB?

no, Sugino 75s are 109mm
****mano does not produce a tapered 109mm BB that I have seen.

na975 - is it possible to show us the Soma/Sugino/Sugino set-up via a photo?

I'm just curious what length UN73. I think 46x17 used a 107mm UN73 with his Sugino 75s on an IRO frame and it came out pretty well.

well, i'll try to post a pic, but what i'm saying is: although the un73 is 107x68, surgino 109x68, when i put the L&R crank arms on the un73 with the shorter spindal, the arms are further apart from the BB shell (big gap),thats because the incompatibility of the sq tapper of the two diff spindals.the tapper is a bit bigger on the un73 not enabling the crank to slide all the way on.

okay - point of clarification:
what the hell is surgino? is it a sugino knock-off or just sugino spelled wrong?

and yes, the tapers are different (I believe the Sugino 75s were not ISO). once you put up a pic of the soma with the sugino/sugino set-up I should have a better idea. The soma BB shell is standard and I do not see why it is so troublesome a set-up.
thx

Sugino 75s and Shimano UN 72/3 63 107 are a perfect match on my bike. No ugly gap.
Shimano and sugino tapers are the same. American Cyclery is backing me up on this
https://www.americancyclery.com/SOMA/kitspecs.html Look all the Sugino 75 cranks are paired with UN bbs. Here some more info on this topic. https://www.bikeforums.net/singlespeed-fixed-gear/83852-cheap-bottom-bracket.html

46x17 saves the day!

(i'm not joking--that's some helpful info)

46x17 you say it works on your bike, which bike do you have? rush? sorry i mispelled sugino, if its a knock off crank, then maybe i should get a refund from business cycles! and the tapers are different on them two BB's, i bought it cause someone said it matched, O'well.

the bike (frame) should not matter much. I have an IRO mark V.

Are the tapers skinnier in the end or wider or is it just spindle length you are referring to?

Sugino 75s like a symmetrical spindle. The 107 shimano spindle is symmetrical. The 110 isn't. What spindle length are you using. If you use an aymmetrical spindle You will have a big gap. Also, your cranks should not slide up all the way onto your spindle.

we'll, i just used the matching BB for the sugino75 crank, it works/looks right. If the BB is labled L-R, does this mean you have to place it in the BB shell just only one way, and not reverse it,cause the drive side is longer?

Are you talking about the sugino or the shimano BB? The sugino should be symmetrical not longer on one side. Shimano for some f##ked up reason make their spindles differ on the non drive side on some of their bbs. Not sure what the point is. But hey, they are shimano!

Whether or not it is reversible depends on the threads in your BB shell and/or on the type of bb you are using. Phil wood for example are all reversible. Some cup and cone bbs you can reverse the spindle and/or cups. Usually there is no reason not to stick with the L/R specifications of the manufacturer unlell you are trying to solve some chainline or q-factor issues.

i'm talkin about the shimano BB,i just took off the bike and installed the sugino75 which fits really well, but still the chainline I noticed is OFF. i have DA 7600 hubset W/ DA sprocket. NOW what am i gonna do, i hope i dont have to buy a DA crank now?

keep in mind that the shimano UN-53 and UN-52 bottom brackets are meant for road or mountain bike applications, which need to have more spindle on the drive-side in order for the chainrings to clear the frame. they could make both sides the same length, but then we'd end up with more 120mm and 124mm spindles, and wider Q-factors and more broken spindles.

Perhaps the reason the Shimano 110mm BB has a longer Non-Drive-Side is so you can use a spacer on the Drive Side and still have some spindle on the NDS. So whereas the 107mm would give you a certain chainline, the 110mm would give you that same chainline +3mm (using spacers) to play with.

...or you could just get the right spindle length to begin with and not have to deal with spacers.

ques: i went to put my new chain on, its too long? i bought a half link, so i guess i have to remove some links right?

It makes perfect sense what you are saying, BUT the shimanos UN73/2 110 and 107 differ on the NON-drive side. This certainly has NOTHING to do with chainring clearance. What blastradius says makes some sense, but still seems backwards. I'll send an email to shimano to find out what they were thinking.

go away.

Unfortunately the increments in spindle length on the UN cartridges and other bbs are not small enough to always be able to select the right spindle length for the desired chainline. Bottom bracket spacers are machineable to the 1/10 of a milimeter and therefore are an ideal solution for perfect chainlines.