| I’m the wrong person to ask the maximum tire width I’d feel comfortable riding, because the answer has always been the widest I can possibly get away with, providing there’s a mm of clearance in all directions!
And, often, even when there’s not!
I’ve been known to file down both fork crowns and brake calipers, after all. So I am not to be trusted.
That’s said, if it is indeed supposed to be a 659b Atlantis, I would certainly keep it that way.
Do you have a way of contacting previous owners, to find out whether the brake bosses were ever moved?
I found some more info in this old thread about the Toyo-to-Waterford transition.
With the current configuration on my frame the max tire size is likely 1.9 which would leave around 3mm of clearance at the top of the fork crown (super tight).
I believe the AT0299 serial number indicates this was the 299th Atlantis ever made, which would be very strange for it to be 650B but not impossible I suppose.
Also, my frame does not have a kickstand plate or mid fork braze-ons as is consistent with the early Atlantis frames.
As far as I can tell, all of the Waterford Atlantis frames I've seen have mid fork braze-ons and a kickstand plate.
Why not run it as is 650b? Great question! I think really want to try out the 26" 2.3 tire Riv experience... and I just had these wheels built.
What do you think knowing this? Whats the max tire size you would feel comfortable running at 650B?
On Sunday, April 5, 2026 at 12:29:30 PM UTC-4 Joe Bernard wrote:
Well then. No knowledge of that Waterford frame, please disregard my entry in the discussion.
On Sunday, April 5, 2026 at 9:19:24 AM UTC-7 Brian Turner wrote:
If anyone follows Marcus (@probablyriding) on social media, he has a Waterford-made, 56cm 650b Atlantis with pointy lugs. I know because he and I were both bidding on the same frame when it was up on eBay.
Brian Lexington KY Is there a reason not to just run it as-is, with 650b wheels?
P. W. I agree this looks like a Toyo frame with the canti posts moved, I don't believe there were any Toyo 650b and the Waterford frames did not use pointy lugs. I see no reason not to reconvert it and paint.
Joe Bernard
On Sunday, April 5, 2026 at 8:10:10 AM UTC-7 Jamie D. wrote:
I have what I believe to be a 56cm Toyo Atlantis:
• The serial number is AT0299.
• The frame measurements match the geometry chart.
• It has the curvy chain stays.
• The lugs look to be the style used on Toyo frames.
Imagine my surprise when I go to put my brand new, fancy 26" wheel set into the frame and something looks off... the canti posts look too high. I go and grab a brake caliper to check and it's confirmed, too high for 26" wheels (sigh). I then put a 650B wheel in and the brake caliper lines up correctly.
Since the frame has also been repainted, I'm assuming a previous owner had the canti posts moved for 650B wheels.
The fork clearance horizontally inside the fork and in the chains stays where a 26" tires would go is 65mm. With a 26" wheel in the fork, the vertical clearance is 65mm from the top edge of the rim to the bottom edge of the fork crown. With 650B wheel in the fork, the the vertical clearance is 52mm from the top edge of the rim to the bottom edge of the fork crown.
My impulse is to get the canti posts moved back into the original position and repaint. I got good deal on the frame, I'm hoping this will be a "forever bike" and it will be fun to choose my own color.
Do you agree that the canti posts have likely been moved? Is there any reason not to move them back other than the cost of moving the posts and repainting?
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