Sugino Granny Gear

[John Rinker]

Good afternoon,

Can anyone shed light on whether the granny gear on the Sugino triple crank is symmetrical and therefore reversable?

Thanks. 

[dougP]

On the spare I've got, the bolt holes have a counter-sink for the mounting bolts, so probably not meant to be reversed.  OTH, if your drivetrain has some clearance in that area, it may not matter.

I have a couple of granny rings & can check for that detail & the manufacture.  I know the Sugino I have has the countersink. 

dougP

[Nick Payne]

Depends on the chainring. Aluminium granny rings are thicker than the thickness of the teeth, and usually have the teeth slightly offset to one side, so if you reverse one of those, that alters the effective spacing between the granny and middle chainring. They also have the mounting holes relieved on one side for the head of the chainring bolt.

Stainless steel granny rings are normally no thicker than the teeth, and have no relieving of the bolts holes, so they are fully reversible.

Nick

[dougP]

John:

I lied.  The Sugino I have does NOT have any countersinks.  The one with the countersinks is a Shimano.  The Sugino feels heavier so I suspect it's steel & Shimano is aluminum. 

dougP

On Thursday, October 8, 2020 at 7:27:55 PM UTC-7, John Rinker wrote:

[Paul Brodek]

Gee, I had a whole spiel ready to post, but doug 'n' Nick P. said it all first.

I'll just say that I just checked my on-hand stash, both aluminum and steel, and can confirm what they've said.

Paul Brodek

Hillsdale, NJ USA

[John Rinker]

Thanks All,

The granny I've got is stainless, without countersinks, and therefore, if I've read correctly, reversible. Woo hoo!

Cheers,

John

[dougP]

John:

You wore out a stainless granny gear?  How in the world?  The original steel Sugino that came on my Atlantis in '03 still looks good & works fine, & I've used it (what I thought was) quite a bit.

BTW, if anyone else wants a granny, I've got a couple of 24 & 26 tooth ones, some aluminum, some stainless.  I collect things "just in case"

dougP

[John Rinker]

The granny and I had a bet to see who would wear the other one out first, and I'm a stubborn bastard! May have been grinding up and down the Himalayas for a couple of years. 

I'd definitely be in for one of those stainless grannies, but shipping to Japan may not be wise considering it was probably made somewhere hereabouts. 

 Cheers.

[dougP]

John:

It's getting expensive enough just using USPS here in the states.  Shipping to Japan would be more than the cost of the ring, I'm certain.  Yea, you could find something on that side of the Pacific. 

"Grinding up & down the Himalayas" sounds like the way to do it.  Tough duty.

dougP