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Old 01-28-16, 05:15 PM   #26
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Hi All,

I'm helping Randy post some of the slide images. I'll post them as often as possible. I haven't really posted much before so if I screw up the picture uploads, I'll figure it out and redo it.
Not the most exciting shots but interesting none the less. These are from 1978....





Thanks for posting these! Probably the best images from the factory I've ever seen. Really looking forward to the rest of the slides.
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Old 01-28-16, 06:39 PM   #27
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Well I am focusing on the BB rebuild now but have run into some of the usual problems. Worn cups. At least the axle is still good. Went to measure and found out the BB length is 70mm. Then put the micrometer on the axle itself, 130mm. Yow!

Will look in my stash to see what cups I have to use but hoping a sealed unit can work.

1973 SHS

Wheels did not ship with the frame but later traded for the Shimano high flange hubs that were still good. Should make a nice wheelset laced to some Japanese rims.
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Old 01-28-16, 07:00 PM   #28
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Well I am focusing on the BB rebuild now but have run into some of the usual problems. Worn cups. At least the axle is still good. Went to measure and found out the BB length is 70mm. Then put the micrometer on the axle itself, 130mm. Yow!

Will look in my stash to see what cups I have to use but hoping a sealed unit can work....
It's a good thing that the spindle is OK because many of the Sekine from this era used the SR Silver crankset, which uses a rare 3 degree taper instead of the standard two degree taper. If so, you are not going to find a sealed cartridge unit that is compatible with these arms. Check the markings on the spindle. it sounds like you may have a 5K or 5M spindle, which are three degree taper. The model should also be embossed on the crank arms.
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Old 01-28-16, 07:19 PM   #29
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Spindle is marked 3K

No such marking on the arm cept a raised T Japan JIS.
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Old 01-29-16, 09:56 PM   #30
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Spindle is marked 3K

No such marking on the arm cept a raised T Japan JIS.
The 3K is a 3 degree taper spindle for a 68mm shell. I don't recall the Sekine having extra thick cups but that may be the case to explain the 3K versus 5K spindle. A lot of those cranks had "SILVER" embossed below the SR logo but that appears to be the same crankset used on the Sekine SHB & SHC in the mid-1970s. IIRC, the fit on a 2 degree taper spindle isn't even close.
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Old 01-29-16, 10:41 PM   #31
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The 3K is a 3 degree taper spindle for a 68mm shell. I don't recall the Sekine having extra thick cups but that may be the case to explain the 3K versus 5K spindle. A lot of those cranks had "SILVER" embossed below the SR logo but that appears to be the same crankset used on the Sekine SHB & SHC in the mid-1970s. IIRC, the fit on a 2 degree taper spindle isn't even close.

All very interesting. I will get a pic and measurement of the cups tomorrow. Usually I see the work silver on the crank caps covering the bolts.

Thanks for the explanation T-Mar.

Last edited by 3speedslow; 01-29-16 at 10:42 PM. Reason: auto correct what?
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Old 01-30-16, 05:28 PM   #32
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Pic of the NDS cup size 21.59 mm.

looks wider then usual

BB Definately is 70 mm
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Old 01-31-16, 08:06 AM   #33
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What you need to do is measure the thickness of the outer face of the cups and compare them to other cups. Given, the 68mm spindle in combination with the 70mm shell width, the Sekine cups should be about 1mm thicker.

Yes, some versions of the cranks had Silver on the dust caps but others had them on the crankset itself. Just be glad this wasn't the SR Silver cottered, aluminum crankset!
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Old 02-05-16, 12:48 PM   #34
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The 3K is a 3 degree taper spindle for a 68mm shell. I don't recall the Sekine having extra thick cups but that may be the case to explain the 3K versus 5K spindle. A lot of those cranks had "SILVER" embossed below the SR logo but that appears to be the same crankset used on the Sekine SHB & SHC in the mid-1970s. IIRC, the fit on a 2 degree taper spindle isn't even close.
I believe that the 3K is a spindle size code, which needs to be decoded. Sheldon Brown's site gives some examples:

Sheldon Brown's Bottom Bracket Size Database
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Old 02-05-16, 01:23 PM   #35
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What you need to do is measure the thickness of the outer face of the cups and compare them to other cups. Given, the 68mm spindle in combination with the 70mm shell width, the Sekine cups should be about 1mm thicker.

Yes, some versions of the cranks had Silver on the dust caps but others had them on the crankset itself. Just be glad this wasn't the SR Silver cottered, aluminum crankset!
yes, the cups are a little thicker then others. I guess that would make up for the extra she'll width!

I could stand to try one of those cottered aluminum crank Sets! I don't torque much on my pedals. At least I could say I tried them.

So if I was to get a Shimano 68 mm BB replacement and use a 2 mm spacer I should be able to put the old crankset back on? I've heard Shimano does not make a 70 mm in ISO threading, only Italian.
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Old 02-06-16, 06:58 AM   #36
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yes, the cups are a little thicker then others. I guess that would make up for the extra she'll width!

I could stand to try one of those cottered aluminum crank Sets! I don't torque much on my pedals. At least I could say I tried them.

So if I was to get a Shimano 68 mm BB replacement and use a 2 mm spacer I should be able to put the old crankset back on? I've heard Shimano does not make a 70 mm in ISO threading, only Italian.
No, it won't work. That 3K spindle is an obsolete 3 degree taper. All the replacement Shimano BB are 2 degree taper. IIRC, your crankarms would bottom out on a spindle with a 2 degree taper and 2 degree crankarm would have very litte engagement with a spindle with a 3 degree taper. if you have a spare spindle or crankarm hanging around, just try mixing and matching. You'll see what I mean. They're incompatible.
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Old 02-06-16, 07:13 AM   #37
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Ahh, so it's all or nothing.

That's why I have so much trouble finding anything to match the SR. cold forged crankset I have too.
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Old 02-06-16, 10:57 AM   #38
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I have an NOS 3-arm SR crankset that was commonly seen on Sekines back in the day. If someone here is interested, shoot me a PM and I'll get pics.
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Old 02-06-16, 06:42 PM   #39
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I have an NOS 3-arm SR crankset that was commonly seen on Sekines back in the day. If someone here is interested, shoot me a PM and I'll get pics.

Yes to pics.
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Old 02-06-16, 06:53 PM   #40
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I'll dig it out and take pics tomorrow.
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Old 02-07-16, 07:22 AM   #41
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Ahh, so it's all or nothing.

That's why I have so much trouble finding anything to match the SR. cold forged crankset I have too.
Just because a crankset is SR, don't assume it is 3 degree taper. The majority of SR cranksets are 2 degree taper. However, given that the 3K spindle is 3 degree taper, it would be very easy to check by putting the SR cold forged crakarm onto the 3K spindle and seeing if it is a proper fit.
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Old 02-07-16, 09:52 PM   #42
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I'll dig it out and take pics tomorrow.
I got the pix, but it's my bedtime now, so I'll try to post them up tomorrow.

BTW, documentation with the crankset indicates that the taper is 3 deg.
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Old 02-08-16, 08:13 PM   #43
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Here are the pics, starting with the wrapped condition as I received the crankset.

You might need to click this link to get access. Outlook and Bikeforums don't play well together.



















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Old 02-08-16, 08:18 PM   #44
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last but not least,

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Old 02-08-16, 11:10 PM   #45
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Thanks for the pics! That is the exact crank I have tho' mine is used. It came originally on a 70's Austrian Ted Williams bike. Where did you come up with an NOS set?

So the 3 degree has been the boogey man in my attempt to find a spindle to fit this. Now I have a spindle and a choice between 2 crank sets but no cups worth using. Continue to dig through my bin.
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Old 02-09-16, 05:37 AM   #46
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Too bad it has Sugino dust caps.
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Old 02-09-16, 01:00 PM   #47
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This is the SR. crank that I have, just like Old's cool has.

melt forged. Caps say* cotterless*silver* on them.

axle fits perfect!
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Old 02-09-16, 07:44 PM   #48
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Where did you come up with an NOS set?
IIRC, it came with a bunch of random 70s parts & accessories such as cables and cloth handlebar tape to my late Dad from a contemporary friend of his who also dabbles in bikes. Or maybe the other way around, it was in my Dad's collection, and I got first dibs on stuff of interest to me, leaving the rest for his friend. How it came to be in that collection, I have no idea. Back in the 70s, my Dad used to collect & hoard all kinds of bikes & bike stuff, mostly from the curb waiting to be picked up as trash, but I suspect he also jumped on any clearance bargains in the LBS or department store. I still have a Shimano Crane derailleur that I got new from him, back in the day, that he must have gotten cheap somehow (he never would have paid the going price).
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Old 02-09-16, 08:19 PM   #49
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Cool story. Always a good one when it comes to vintage bikes!

I'd be tempted to use the stuff, especially the crane.

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Old 04-29-16, 10:33 PM   #50
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All right..... Time to hijack back this thread!!

Sorry, life has been a bit busy....part of which was acquiring a 1974 Sekine SHS and a 1988 Sekine Verona!!

Here you go Sekine fans.....Here are a few more factory slides...
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