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Old 06-21-09, 11:14 PM   #1
Glennfordx4 
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Please Help with ID on SR crankset and BB problem

Ok I am on the home stretch of my Concord Pacer S/S build and I am down to picking out the right size square taper shaft to set my chainline up when it all came to a screeching halt.The Vintage NOS SR crankset that was to be one of the focus points of the build has thrown me for a loop and now I would,1 like to find out what the crankset is and 2 find out if there is a way to use it without breaking the bank.I will suppy pics and try to answer anything I can.
The main Problem is that the square taper in the crankset is bigger then any square taper shaft I have and after searching online and reading all about JIS and ISO sizing I thought I understood it until I start reading other peoples questions and answers.I can say that all the square taper shafts I have I thought they were JIS as they are on cheap and better built bikes that I have and have always changed in the past. I do not have any vintage Campy stuff to compare this crankset too to tell if it is ISO or JIS or just made wrong. All of the square taper shafts that I have fit in until they bottom out and are very loose at this point they can't be tightened at all just holding it in your hand you can see why. I took some measurements with my NSK digital calipers and here is what I have on my CS the taper goes from 14.23mm down to 12.97 and the standard crankarm goes from 13.24mm to 12.38mm and the shaft I am measuring (which is like all of them I have about 15 ) goes from14.27mm down to 12.72mm in 16.75mm of shaft.I would really like some help with this and I would really like to use this CS in my build but if I can't is it worth anything so I could sell it and get a nice CS that will work and that I will like,it has to be vintage and lite this one is all alloy.Sorry for the long post but I couldn't think how to shorten it.

I will post some pics of the crankset and some on a shaft along with a standard crankarm and I hope someone can help me





this is the first pic of it on the shaft

Second shows that it can't go down no more

this is standard arm and it has room to tighten down.

this shows that there is room for it to come down more on the taper.


If this is a ISO crankset can I get a square taper shaft for a 68mm BB and if so how would I know what size to get to set my chainline I am running a 5 speed out back and I want a double up front.This was a cottered crank bike but the BB shell is standard 68mm

Last edited by Glennfordx4; 06-22-09 at 05:19 AM. Reason: added info
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Old 06-23-09, 05:47 AM   #2
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Well, I know for sure that you have a SR Apex crankset. Perhaps your best bet would be to go to your local bike shop, one that has been in business for many years, and go through their box of bb spindles. Try to obtain a complete bb spindle with L and R cups, to make sure that everything fits correctly. JIS is the standard, I believe , for this crankset.
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Old 06-23-09, 06:36 AM   #3
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Well, I know for sure that you have a SR Apex crankset. Perhaps your best bet would be to go to your local bike shop, one that has been in business for many years, and go through their box of bb spindles. Try to obtain a complete bb spindle with L and R cups, to make sure that everything fits correctly. JIS is the standard, I believe , for this crankset.
Thanks I am not sure if it is an Apex as the big chain ring can't be replaced on mine and all the Apex cranks I have seen it can be,but it looks like one except for the fluted arms on mine, and as far as the bike shop I was going to do that but after hours of researching yesterday it has to be ISO and I got a good deal on a sealed lower unit 68x115 with a ISO taper so I will give it a try although I didn't want a sealed unit square taper shafts in ISO taper are getting rare and the ones I did find were over $100,This is the only thing holding me up and I really want to ride as it is I missed some of the best weather for it.I have a bunch of square tapered spindles and they have to be JIS because that is the norm and it is what is on about 30 bikes I have and this won't fit any of them and the only square tapered spindles I don't have are ISO which from what I read is for track cranks,Campy,Mitche and other Italian bikes which I have none.I would have just installed a JIS crankset but everyone that I looked at didn't appeal to me the pics of my crankset don't do it justice it really is gorgeous.IF this doesn't work I would like to find a Apex crankset as it is the only one that looks like it,again thank you for your help.
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Old 06-23-09, 07:15 AM   #4
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You have a JIS spindle, size 5SB. Sheldon probably has a chart that will tell you exactly what that means as far as length and asymmetry. Armed with that info you can calculate the spindle you need.

My SR Silstar crankset came with a 5SS spindle and that sucker was about 125mm IIRC.

Edit: Scratch the above? After re-reading and re-looking, I think I'm now following your issue. I can guarantee you that if that 5SB (JIS) does not work in your crank an ISO definitely will not. The only answer I have is that your crank hole has wallowed out due to improper tightening and is toast.

Last edited by Ex Pres; 06-23-09 at 07:32 AM.
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Old 06-23-09, 07:40 AM   #5
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I have come across this crankset and the taper size is odd. I remember building up a bike for one of my daughters and wanted to use this set because it was a short length. I had to dig deep in my collection to find a matching spindle.
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Old 06-23-09, 07:47 AM   #6
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You have a JIS spindle, size 5SB. Sheldon probably has a chart that will tell you exactly what that means as far as length and asymmetry. Armed with that info you can calculate the spindle you need.

My SR Silstar crankset came with a 5SS spindle and that sucker was about 125mm IIRC.

Edit: Scratch the above? After re-reading and re-looking, I think I'm now following your issue. I can guarantee you that if that 5SB (JIS) does not work in your crank an ISO definitely will not. The only answer I have is that your crank hole has wallowed out due to improper tightening and is toast.
This crankset has never been mounted and I removed it from the package myself ,it came from a friend that had owned a bike shop for over 20 years and gave all of his stock to me.That spindle you see is just an example and is a JIS short taper,but short or long it doesn't matter they all fit the same way and are loose thats why it was so confusing to me I never had this problem with any crankset in the past and I don't know much about ISO sized square taper (since they are the only 2 listed ) shafts so if the BB I got won't work I can only say that this is a defective crankset. thanks
Glenn

Last edited by Glennfordx4; 06-23-09 at 07:50 AM.
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Old 06-23-09, 07:55 AM   #7
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I have come across this crankset and the taper size is odd. I remember building up a bike for one of my daughters and wanted to use this set because it was a short length. I had to dig deep in my collection to find a matching spindle.
Do you remember what the taper was because I do have a lot of spindles and sealed BB units all in JIS and not one of them come close I even have NOS stronglite shafts and they won't work ,I removed a bunch more BB shafts yesterday from bikes that range from the mid 70's to a few years old,and a lot had SR cranksets but not one fits

EDIT- I FOUND ONE!!!!,After reading this post I went out to my shop to get a phone # of a LBS that has been around and for what ever reason I went to a box on a self that has some misc bike parts in it that I haven't put up yet and ther was a BB shaft sitting in it so for the hell of it I tried it and it fit,I don't no about the chain line but it looks close.the shaft is NOS and the only marks are 5K on it and I looked at all the others I have(there still spread out on my bench) and most start with a 3 and then a letter or other markings,so is there a chart that tells what the # and letters mean,I didn't see one on Sheldons site.I was able to cancel my order for the ISO BB I ordered to boot yeah!

Last edited by Glennfordx4; 06-23-09 at 08:26 AM.
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Old 06-23-09, 09:32 AM   #8
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That was lucky... you must be livin' right!
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Old 06-23-09, 10:28 AM   #9
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That was lucky... you must be livin' right!
Yeah man just got done installing it with a NOS Tange cup and bearing assy and the chainline is perfect,but I have to take a break to get a customers lawnmower fixed after lunch,but when I am done that I should have it buttoned up(although my gold plated chain isn't here yet) and will install a chain to set up the derailleurs,man I can't wait.
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