Sam Hillborne with 700x50 tires and some room to spare

[Brent Eastman]

For anyone wondering. For anyone who likes to fill their frame to the point of irresponsibility.

I found a very low priced set of like-new Soma Cazadero 50s and mounted em up. Measure 47mm actual on Velocity Atlas rims. I have a 2017 non-canti Sam.

Clearance is minimal, but I've seen tighter. It's tighter in the rear at the seat stay than anywhere up front. Probably the absolute max I would run. They ride great, I had 42s and loved them, I wish they would make a 45/47.

[John Bokman]

Brenton, I've got a 2017 Sam like yours. I had canti posts brazed on, and have used Bruce Gordon Rock n Roads in 43mm. They are fantastic riding tires! I have more space still, of course. I think I might be able to fit the R&R 48s in there? You might want to try those, if you are looking for a slightly smaller than 50mm tire?
 They roll surprisingly well on pavement and are outstanding in the loose stuff. Super good people at B. Gordon, too.

https://brucegordoncycles.bigcartel.com/product/700c-x-48mm-rock-n-road-tire

John

Oregon

[J]

On my 2010-11 size 60 Sam H, size 50mm gravel king SK spun freely with the bike in the stand but rubbed the fork blades when actually riding, especially leaning into a turn. I remember experimenting with pressure but it did not help. I'm always about 170lbs and wondered if a lighter rider might've lessened tire deformation. I'm no expert

[Brent Eastman]

There’s all kinds of factors at play. The 50mm gravelkings might have been 50mm actual and yeah that could definitely rub with some torque. Rim width makes a difference also. I’m 185lbs and I haven’t had any rubbing yet despite some spirited riding on these tires’ maiden voyage. The cazadero at the widest point (the knobs) was a hair under 47mm. The rock and road 48mm measure 50mm according to Bruce Gordon website, so those might also be sketchy. I had a friend with a canti Sam who said his 48mm Rene herse knobs rubbed in the rear. The tires I got were $50 for a pair so it felt like a good price to experiment with. 

[R Olson]

Thanks, Brenton.  I just got and built up a newer 60cm Sam with canti's and was curious about the max size myself.  I put on Schwalbe Marathon Greengaurds labelled at 50mm, about 47mm actual and they fit fine (mounted on Atlas and Cliffhanger rims - I tried on two sets of wheels with the same results).  I actually have a bit more clearance than you show in your pics.  I was wondering if the larger Cadezaros would fit with the knobs.  Good to know.

[Patrick Moore]

Speaking of Cazaderos, can anyone say how well these seem to roll compared to similar Rene Herse knobbies — I think that the Oracle Ridge is the closest in width.

Aside: the ORs are lovely tires: roll very well indeed on pavement, and corner like road tires, at least on my Matthews “road bike for dirt.” Alas, they don’t set up well tubeless and I replaced them with 53 mm Thunderburts, which are very nice but don’t roll quite as freely and don’t corner as seamlessly on pavement — very small deficiencies compared to the ORs but noticeable nonetheless. BUT! The TBs set up tubeless impeccably; I seated them with a skinny road pump and they held 40-50 psi (in real world riding, 18 psi) even before I put sealant in.

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Patrick Moore

Alburquerque, Nuevo Mexico, Etats Unis d'Amerique, Orbis Terrarum

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