650b Atlantis Sizing for an 85PBH

[Alex K]

Hey all.  I know Atlantis sizing is a hot topic around these parts.  At the risk of being redundant, I am trying to figure out which Atlantis is the one for me.  I recently bought a 56cm Atlantis 650b frame from the RBW Garage Sale, thinking that it was the perfect size for me.  Now that I am getting close to building it up, i’m starting to doubt myself.  I have an 85 PBH.  I tend to like bikes a LITTLE bit on the smaller size.  Wondering if perhaps the 53 Atlantis is actually the one for me.   Anybody have ANY advice at all?  Thanks a bunch.

Alex

[Ed Fausto]

Hi Alex,

I am not sure if you have checked the pbh chart at Riv's website.

Based on the pbh chart, it looks like a 53 MIT Atlantis would best fit a 85 cm pbh.

It is perfectly in the middle of the range from 83 to 87 cm pbh.

https://www.rivbike.com/pages/pubic-bone-height-how-to-measure-your-pbh

Check Riv's chart.

On Tue, Oct 13, 2020 at 8:54 AM Alex K <ack...@gmail.com> wrote:

Hey all.  I know Atlantis sizing is a hot topic around these parts.  At the risk of being redundant, I am trying to figure out which Atlantis is the one for me.  I recently bought a 56cm Atlantis 650b frame from the RBW Garage Sale, thinking that it was the perfect size for me.  Now that I am getting close to building it up, i’m starting to doubt myself.  I have an 85 PBH.  I tend to like bikes a LITTLE bit on the smaller size.  Wondering if perhaps the 53 Atlantis is actually the one for me.   Anybody have ANY advice at all?  Thanks a bunch.

Alex

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[dougP]

Alex:

I have an 84cm PBH & ride a 58cm Atlantis from Toyo.  I've also ridden a 56 cm & can fit either one. I'm in an overlap of the two sizes as made by Toyo.

Now to your question:  Do you know if the 56 cm 650B is from Waterford or Taiwan?  There was a brief period a while back when Waterford made the Atlantis.  I rode a 56cm 650B Waterford & it was a nice fit & nice ride.  Toyo's Atlantis was 26" wheels. 

For the MIT (current version), there is no 56 cm.  53, 55, 59, but no 56.  I rode a 53 cm without knowing it's size & assumed it was a 56.  It felt great, especially the ride quality with the longer wheel base.  After the ride, they told me it was a 53, and I was pleasantly surprised.

I'll bet if you build it up & ride it, you'll love it. 

dougP 

[Jonathan D.]

I have an 85 PBH and ride a 56 Waterford I am debating selling but not because of fit.  I also rode a 58 Toyo Atlantis.  Both were great and I would have gone just with wheel size.  I would buy a 53 MIT and ride a 55 Joe Appaloosa. 

[Brent B]

84~85 pbh and 5'9" here and I'm on a size 53 MIT Atlantis (from February '20), and the fit is working pretty well for me. I also considered the 56 and I think it could have worked, but I'd have needed a short stem. My current setup is an 80cm stem wiith Ahearne+Map bars, set kinda low. Also tried bullmoose bars, which were great if I set them a bit higher up, and i have a 120cm stem w/Billie bars that works nicely for more relaxed riding. 

I also ride a old 55 All City Space Horse canti and a Med/55 Crust Lightning Bolt. 

You could maybe make the 56 work if you want to learn to love a bigger bike fit; according to the charts you can clear the standover even if you max out your tire size, but it's gonna feel like a big bike!

I think this sizing is accurate to our Atlanti:

https://bikeinsights.com/compare?geometries=5ad1288a9127aa0014fa1d9b%2C5ad1288a9127aa0014fa1d9a

-Brent

[Joel S]

My PBH is 80.6 and the 50cm was a great fit.  I know it does not answer your question, you can call Riv for their thoughts.  

[Mike Packard]

Hi Alex

There was at least one run of MIT 650b 56 Atlantis, I have one. PBH 87. They removed it from the current geo charts but you can find it here: http://web.archive.org/web/20190224110651/https://www.rivbike.com/pages/geometry

I do like the bigger bike feel, and almost feel like my Atlantis is small-ish, but I feel part of that might be the 650b wheels. You can probably make your 56 work but if you prefer the smaller bike feel maybe 53 is better (if you can find one).

mike

not much help in austin

[Alex K]

Welp.  The 56 was a bit too big.  It went back on the RBW site and sold real quick.  Thanks for all your help, made the decision SO much easier.  If anybody has a 53 Atlantis 650b frame or complete laying around, holler at me!!!

Happy trails all.

Alex

[Paul Budnitz]

Hi Y'all.

I have both a 53 and a 56 Atlantis (though the 53 may go up for sale soon).  My PBH is also 85-86.

Both actually fit well for me, but the 56 allows me to get bars higher more conveniently.  

I should add that they are both 2018 MIT, so slightly shorter reach!!

Best.

Paul