RivSister 55 cm Platypus for Sale

[Roberta]

Original RivSister 55 cm Mermaid Platypus for sale.  I checked with my RivSisters and they said it was OK, since I also have a Betty Foy and an A. Homer Hilsen. 😊

I’m the original owner of this first generation Platy with the sexy swoopy top tube/seat tube attachment,  speced and built in May 2020 by the awesome James and Candice at Analog Cycles in Vermont.  It was meant to be a replacement for a more rugged Joe Appaloosa, which I sold to get this bike for both road and trails, but I don’t do much non-road riding, so I’m letting this go to someone who would ride and appreciate it.  It rides just as well on paved roads, too, but I have bikes for just that; I don’t need this beautiful redundancy. 

Since I have other bikes, this one got partial use, and I’d estimate 1-2000 miles, no more than that and probably closer to the lower end.  Most miles have been road miles and this bike is great for that.  I’ve taken it on the D&L Canal towpath (Washington Crossing State Park in PA/NJ) a couple of times, which is packed dirt with pea gravel.  It rode beautifully.  Not ridden in rain or snow, but it got wet during car transportation, and there is some springtime riding salt spray on the rear cassette which does not interfere with its use, that I wasn’t able to clean completely.  The chain is starting to show signs of rust, but the bike shop cleaned it, lubed it, measured it this fall and told me it would be fine for awhile. Always kept inside, in my living room.  It’s in great condition.

Well maintained by the mechanics at Keystone Bike and me.  Orange Seal Endurance added to tires in January and checked over at that time.  No known dings or chipped paint except tor the screw holes on the fork crown— 90% is painted; please see pictures.    An additional new-in-box 1x11 Garbaruk rear cassette (retail $280) is included.  Unlike other “it’s ready to ride” claims, this bike really is; I take care of my possessions.

I’m in Philadelphia and I’m willing to meet a serious buyer up to an hour-ish away.   Once you take her for a spin, you’ll want to ride her home.   I’m also willing to have it packed and shipped at buyers expense. Or, pick it up at the Philadelphia Bike Expo in March, if still available. 

Since I don’t have the skills to disassemble, I’d rather sell this bike fully built.  

$3,500.  Venmo, Zelle, or PayPal Friends and Family.  

BUILD HIGHLIGHTS (detailed build sheet below)

2020 55 cm Mermaid Platypus frame 

Rivendell Billy bars, with 1 cm cut from length (it comes way back)

Nitto extra tall 10 cm stem

Garbaruk 1x11 drive train with index shifting

Dynamo hub and front and rear lighting system

Additional battery powered rear fender light

Gravel King SK+ tubeless tire setup

Pacenti  Brevet rims with fun colorful nipples and valves

Full fenders

Brooks B68 saddle

Ergon grips

Greenfield kickstand

Water bottle cage

Additional new in box Garbaruk rear cassette 

***The rack is not included.***  

Please DM me with any questions.   Thank you for your time and consideration.  I’m looking forward to moving this to another happy owner.

Roberta

Philadelphia, PA

BUILD DETAILS

FRAMESET 

Headset 1"
Stock FSA Sealed Bearing

Headset Spacers 1"
Basic Alloy 10mm

Stem, Quill
Nitto 10 cm xTrall 

Handlebars Trekking
Billie Bars, shortened 1 cm

Grips 
Ergon GE1

Mtn Brake Lever, LP
LitePro Levers

Rim Brakes
Litepro w/ Koolstop Pads and Stainless Hardware

Trigger Shifter 11spd

SRAM NX

Shift Cables x1 TL 
Jagwire Sport

Shift Housing Interrupted
Jagwire Lined

Brake Cables TL

Jagwire Sport 

Brake Housing Interrupted

Jagwire Lined

Ferrules 

Brass

Saddle

Brooks B68

Seatpost 26.8

Nitto, Rivendell's standard one

Chain

Connex Stainless 11 speed

Pedals
Clem Pedals

Crankset 1x square taper
New Albion with trouser guard + wolftooth ring

Chainstay Protector
Clear Plastic

Cassette
Garbaruk 11 speed

Rear Derailleur Mtn 1x
SRAM NX Rear Mech

700c Rim Brake Rim
Pacenti Brevet 700c

Front Hub 6 Bolt
Shutter Precision  Dynamo

Hub Rear 6 Bolt
Bitex

Spokes
Sapim Race

Spoke Nipples
Sapim Alloy

Valve Stem
WTB Alloy

Rim Tape 
Analog Tubeless Tape

Tires 700c Road
Panaracer Gravel King SK+ 700 x 43

Quick Release Front
Shimano

Quick Release Rear
Shimano 

Fenders 700c
SKS Longboard

Kickstand
Greenfield

Water Bottle Cage Bolts
VO Mohave with tabs

Additional Cassette
Garbaruk 1x11, new in box

LIGHTS

Headlight Dynamo
Schmidt Edelux II

Light Mount, Fork Crown
B+M Steel

Taillight Dyna Rack
Busch & Müller Toplight Line Plus

Taillight Battery Fender

Vena

[Roberta]

On Sunday, February 8, 2026 at 4:32:18 PM UTC-5 Roberta wrote:

I’m working on getting some pictures posted and then I’ll delete this message. Give me about a half an hour.

[Roberta]

On Sunday, February 8, 2026 at 4:32:18 PM UTC-5 Roberta wrote:

I’m working on getting some pictures posted and then I’ll delete this message. Give me about a half an hour.

On Sunday, February 8, 2026 at 4:26:35 PM UTC-5 Roberta wrote:

[Roberta]

[Roberta]

On Sunday, February 8, 2026 at 4:32:18 PM UTC-5 Roberta wrote:

I’m working on getting some pictures posted and then I’ll delete this message. Give me about a half an hour.

On Sunday, February 8, 2026 at 4:26:35 PM UTC-5 Roberta wrote:

[Roberta]

On Sunday, February 8, 2026 at 4:32:18 PM UTC-5 Roberta wrote:

I’m working on getting some pictures posted and then I’ll delete this message. Give me about a half an hour.

On Sunday, February 8, 2026 at 4:26:35 PM UTC-5 Roberta wrote:

[Roberta]

I’m looking to move this Platypus to have a happy rider be pedaling it around their neighborhood this spring. Rivendell may not have these in stock for months. Complete bike with Dyno, fenders, tubeless, 1x11. Well maintained with extra new in box. no dings or paint chips. $3100

On Sunday, February 8, 2026 at 4:26:35 PM UTC-5 Roberta wrote:

[Doug H.]

Roberta,

That is a beauty! Someone will be getting a fantastic bike! 

Doug