The reasons to pick the 40s are:

more comfy, more durable, more traction, more safety, no slower

The reasons to pick the 35s are:  

you are a gram-counter and want the lighter ones or you are forced to 35s 
because the 40s won't fit

 

On Wednesday, August 7, 2013 12:29:15 PM UTC-7, Mark Taintor wrote:
>
> Thanks for all your thoughts everyone. I've been convinced to stay with 
> the 700c wheels that it was designed for. 
>
> Now as to my other question, 40mm Supremes vs 35mm Supremes? Any reason to 
> pick one over the other? 
> Mark
>
>
>
> On Wed, Aug 7, 2013 at 1:02 PM, William <tape...@gmail.com 
> <javascript:>>wrote:
>
>> Good one, Steve, and excellent point.  
>>
>> If you decide that you don't mind the fact that you can't equip your bike 
>> with brakes in 1) then you could work around the too low BB in 2) by 
>> running too short cranks.  Best of all, run no cranks or BB at all, since 
>> you'll probably want your feet on the ground anyway to provide Fred 
>> Flintstone braking.  You could make it into an adult sized skuut bike! 
>>  That would be fun!  
>>
>>
>>
>>
>>
>> On Wednesday, August 7, 2013 10:32:36 AM UTC-7, Steve Palincsar wrote:
>>>
>>>  On 08/07/2013 12:53 PM, William wrote:
>>>  
>>> You can not run 650B wheels on a 700C Sam Hillborne.  The reasons are 
>>> threefold
>>>
>>>
>>>  2.  Drop.  Grant already dialed the frame design of the Hillborne for 
>>> 700xfat tires.  Among those things that are dialed is the BB drop.  Run 
>>> smaller diameter wheels, and *your already low BB height will be in 
>>> true pedal-scraping territory. * Virtually all recent 700c Rivendells 
>>> are lousy candidates for 650B conversion for that reason.  The roadier Riv 
>>> models of several years ago are good candidates because they were designed 
>>> for 700xskinny and have less drop.
>>>
>>>
>>> ...unless you use very short cranks.
>>>
>>>
>>>
>>>   -- 
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