Surly steamroller - tube diameters?

[PJN]

I’ve got some s and a couplers that were cut out of a broken frame I bought off eBay like 5 years ago in the garage from when I was diy framebuilding. I’ve sold all my gear so I can’t build myself a frame but sort of want a simple single speed travel bike.

The couplers I have are both for 28.6 tubes. The salsa casserole in the classifieds could be a good fit but I haven’t heard back from the seller. Following that idea i was thinking a surly steamroller might be a decent candidate for diy s and a conversion.

Does anyone know the top and downtube diameter measurements?

[darkmother]

I don't have it anymore, but my Steamroller from ~10 years ago definitely had a larger DT than TT. I would think you would need a bigger coupler for the DT.

[AngryScientist]

You know, I never even thought about it, but S&S coupler install is definitely something i would take on as a project in the garage myself.

hmmm

Sorry cant help on the Surly dimension check though...

[spoonrobot]

See below

[PJN]

Thanks for the info, maybe I’ll have to get a friend to miter some tubes for me and borrow some heat sinks.

[AngryScientist]

Originally Posted by PJN

Thanks for the info, maybe I’ll have to get a friend to miter some tubes for me and borrow some heat sinks.

Would you mind expanding on this?

It looks like the tubes just need to be square cut and the couplers silver brazed in. What are you referring to with heat sinks?

[PJN]

Originally Posted by AngryScientist

Would you mind expanding on this?

It looks like the tubes just need to be square cut and the couplers silver brazed in. What are you referring to with heat sinks?

Ah I’m saying if a steamroller doesn’t have the right tube profile for the couplers I have (28.6 tt and dt) that I can remember enough about building frames to cobble a tigged travel bike together around the couplers I already have.

To retrofit an existing frame it’s exactly like you say.

[joralieu]

Just measured my steamroller, my calipers say 29mm. So 28.6 mm is probably right accounting for paint.

[AngryScientist]

Originally Posted by PJN

Ah I’m saying if a steamroller doesn’t have the right tube profile for the couplers I have (28.6 tt and dt) that I can remember enough about building frames to cobble a tigged travel bike together around the couplers I already have.

To retrofit an existing frame it’s exactly like you say.

Thank you for the clarification. I hope you find a donor frame, will save a lot of time!

[PJN]

Originally Posted by joralieu

Just measured my steamroller, my calipers say 29mm. So 28.6 mm is probably right accounting for paint.

Top and down tube?

[Gasman1440]

Originally Posted by AngryScientist

You know, I never even thought about it, but S&S coupler install is definitely something i would take on as a project in the garage myself.

hmmm

Sorry cant help on the Surly dimension check though...

Interesting…..

[joralieu]

Originally Posted by PJN

Top and down tube?

Yes

[unterhausen]

I feel like I'm a pretty good framebuilder, but installing S&S couplers stressed me out a bit the one time I did it. They are big hunks of stainless, so there is a lot to go wrong. Plus I didn't have the installation nuts, so I was worried about the threads. Put a wet rag under some tinfoil and everything worked out okay. Having said that, I keep looking for a wrecked bike with couplers on it to buy.

[PJN]

Originally Posted by joralieu

Yes

Awesome might have to order one and give this a shot!

[joralieu]

I should add that mine is an early one and they may changed by now.