2.25 Thunder Burt on a Platypus?

[Justin Kennedy]

I know it's beyond the official max tire size but wondering if anyone has experience with big ol' tires on your Platy. Specifically, a 29'er 2.25 Thunder Burt (mounted on a Cliffhanger) on a 60cm Platypus. Thanks! 

[Ted W]

No specific experience mounting that combo but I can tell you that 2.25" tires on Cliffhanger rims, for me, measured 60mm. If you've got calipers, you could check the spacing between tubes and get an idea from that.

On Tue, Oct 17, 2023 at 10:04 AM Justin Kennedy <thesix...@gmail.com> wrote:

I know it's beyond the official max tire size but wondering if anyone has experience with big ol' tires on your Platy. Specifically, a 29'er 2.25 Thunder Burt (mounted on a Cliffhanger) on a 60cm Platypus. Thanks! 

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[Ryan Frahm]

I would say it isn’t likely. I have the Soma Cazadero 700x50mm on my wife’s 55 with Cliffhanger rims and there is no room to spare. 

[Mack Penner]

Hi Justin,

FWIW, the April 28 email newsletter featured a 60cm web special platy with 2.3" Teravail Ehlines. Will said: "It clears easily, although I wouldn't go any bigger. I suspect these tires are measured knob to knob, because calipers showed them as closer to 2.1 than 2.3. Still good!"

Mack

[DavidP]

I have a bike with a 29x2.25 Thunder Burt on an i29mm rim, on which the casing measures wider than the knobs and is 56mm / 2.2" @ ~20psi. Variances in individual tires aside that should be a good max as the Cliffhangers are i25mm. I'm pretty sure this would work on my Platypus (60cm) if I didn't have fenders installed which limit me to a 50mm tire.

-Dave

[Stephen]

Hey Justin,

I have a set of 2.25 schwalbe g-ones sitting around if you want to do a test fit. Not quite as knobby so maybe not informative enough. Fit fine on my appaloosa w cliffhangers, again not a perfect comparison. 

[Lonnie]

I have Schwalbe G-one all around tires (29x2.25) on Cliffhangers on my Platypus and they've been great.  Fairly fast rolling, but plenty of traction for some loose trails.  The tires fit the frame fine, though I have to deflate them about to get them around the V-brakes.  The unexpected issue I ran into involved the chain being too close to the tire.  Drive train is old sugino touring triple and 9-sp cassette.  When in the granny ring and biggest two cassette cogs and when riding rougher trails, the chain would hit the tire and get sucked in between the tire and the chainstay.  This never happened on smoother roads.

I eventually bought the widest (and offset) Shimano bottom bracket that Riv sells.  That seems to have fixed the problem, even on the rough trails.  

[Christian B-H]

1) Perhaps needs its own thread, but are Cliffhangers the way to go for a Platy if you’re riding with more weight? I have Atlas now and at least need a new rim, but want to run 55mm tires and something durable for my 200lbs self plus some grocery’s and for sometimes riding it “where you shouldn’t” as grant states. Cliffhangers vs Dyads or something else?

1 A) Anyone have experience with the RH Antelope Pass 55 slicks? Would it be a mistake to make the investment in the ultralights in Black like the crust build below just for the aesthetic, when this will be an around town, grocery and baby hauler bike?

Considering those, Fleecer Ridge, or G One All Rounds to replace the current 50mm Maxxis Ramblers…

2)

Justin, curious to know if you pulled the trigger on the Thunder Burt’s? If so, how’s it work and what’s it look like, and if not, what’d you go with?

Lonnie, are the 2.25 G Ones working well still? Send a pic?

Thanks all,

Christian in Boulder, CO

[Arthur Mayfield]

I’m currently building up my Platy 55 frame, so I don’t have a lot to go on other than measuring clearances, but it looks like 50mm with any tread might be about the limit. Maybe 55mm with smooth tread. I’m fitting mine with 38mm and fenders for mostly paved roads. 

[Justin Kennedy]

Hi Christian et al.,

This was actually a question I posted for a friend of mine who was building up his Platty, and, long story short, the 2.25 Thunder Burts mounted to Cliffhangers do indeed fit the frame. Just barely, but they fit. I'll try to post some pics once he sends 'em. 

I have 2.25 G-Ones on my 60cm Platypus with plenty of clearance. They're mounted to Alex Adventurer2 rims, though, so a little narrower than Cliffhangers. 

FWIW, I talked to Rich at Riv about a year ago about Cliffhangers for a Platypus. He thought they were too wide for a Platy and suggested an Atlas or something similar. I ended up with the Adventurer2's which have been great. Plenty of evidence, though, that Cliffhangers work on Platypus frames. Whether they're "the way to go" or not is ultimately up to you. 

[Lonnie]

I love the 2.25 G-ones.  They work well on the neighborhood singletrack, but don't feel too slow on pavement.  But as I mentioned, they required swapping out the bottom bracket to keep the chain off the tire (when mounted on cliffhangers).  Had I known that would be the case, I would have gone with the 50mm gravel kings.  If I didn't already have cliffhangers, I might have gone with a slightly narrower rim.

[Justin Kennedy]

Also, not sure how I missed this, but Roman's 60cm Platypus on the Riv Staff Bikes pages is sporting 2.25 Thunder Burts. Not sure what rims those are mounted to, though, but they might be black Cliffhangers?  

https://www.rivbike.com/blogs/news/romans-60cm-platypus-86-5cm-pbh

[DavidP]

Christian,

Did you damage a rim or are you switching to a dyno hub?

To me there seems to be not much difference between Atlas and Cliffhangers. Both are fairly hefty with the Cliffhangers being wider (25mm vs 20mm internal). For a Platy, the difference in rim width isn't going to make a big impact as all tires that will fit on a Platy will be fine on an Atlas.

My Platy has Cliffhangers and I sometimes think they are a bit overkill for the 50mm tires I am using but the ~55g weight difference of the Atlas rims isn't worth the switch. If I was using 42mm or smaller tires I'd definitely want a narrower rim (Atlas, Quill, Dyad, etc.).

Looking forward to seeing your made over Platypus.

-Dave