I'd echo Bill, i also have a early canti SH, i max out at 38-40mm with 48mm 
fenders--and most people would not find the clearances acceptable.   i have 
Berthoud fenders on another bike and i think you could push a little more 
than other fenders of similiar size, but i'd not try anything bigger than 
40mm and even then i think you are pushing it.

On Thursday, April 21, 2016 at 12:00:12 PM UTC-4, Bill Lindsay wrote:
>
> It depends on what you mean by "can fit".  Some people mean just that they 
> won't rub in the stand.  It is becoming increasingly common to demand far 
> greater clearance between fender and tire for gravel riding.  Jan is now 
> saying 25mm of clearance all around is ideal, while a lot of people think 
> 15mm is ample and conservative.  
>
> In my experience with a 2009 Canti Hillborne, 45mm tires barely fit with 
> no fenders at all.  It would not be smart at all to even try to run 45mm 
> tires under 50mm metal fenders on gravel.  I doubt it would work at all 
> even in the stand, but even if you got the wheels to turn it would not be 
> smart off pavement.  I'm running real 38mm road tires on that bike right 
> now, but with no fenders, and I believe I have room for fenders with decent 
> clearances.  So, if 40mm Mondials run narrow, they probably would fit.  You 
> might have to get creative with the internal hardware on your Berthoud 
> fenders, though.  
>
> Definitely install Portland Design Works quick release thingies on the 
> front fender if you are really going to ride gravel.  
>
> Have fun!
>
> Bill Lindsay
> El Cerrito, CA
>
> On Thursday, April 21, 2016 at 8:11:48 AM UTC-7, John Bokman wrote:
>>
>> Greetings.
>>
>> I've dug into all the back posts about the various widths and etc. but 
>> haven't found what i'm looking for, so please excuse the redundancy.
>>
>> Here's my setup: 2009 Canti Sam Hillborne @ 60cm. I'm running 50mm 
>> Berthoud fenders. I've got Velocity Synergy 23mm rims.
>>
>> Question: What is the largest Marathon Mondials I can fit given this 
>> setup? 700x40? 700x45? Remember, I've got fenders, and I'm not taking them 
>> off.
>>
>> I am under the impression Mondials are about 1.5 mm thinner than their 
>> stated size.
>>
>> I'm itching to do some dirt/gravel road touring!
>>
>> Thanks to all.
>>
>> J.
>>
>

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