[RBW] Re: Crankset & STI Compatibility

[Garth]

The Sugino info sez it's for 10/11 speed.  
https://www.suginoltd.co.jp/us/products/road/ox.html


On Sunday, October 20, 2019 at 12:20:32 PM UTC-4, RDS wrote:
>
> Anyone know if Sugino XO601 Compact Plus double cranksets are compatible 
> with STI shifters?  Thinking 42-28 for a Roadini.  If STI is compatable w/ 
> this type of crank, what is the biggest cog that I can put on the rear if 
> using a FD such as CX70.  Probably thinking 9 speed, will consider 10.  Any 
> advice appreciated.
>

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[RBW] Re: Crankset & STI Compatibility

[RDS]

"Shimano 10/9 speed compatible and SRAM 10 speed compatible"  .. is what the 
bike mania website had to say about the xo601

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[RBW] Re: Crankset & STI Compatibility

[Benz, Sunnyvale, CA]

On Sunday, October 20, 2019 at 9:20:32 AM UTC-7, RDS wrote:
>
> Anyone know if Sugino XO601 Compact Plus double cranksets are compatible 
> with STI shifters?  Thinking 42-28 for a Roadini.  If STI is compatable w/ 
> this type of crank, what is the biggest cog that I can put on the rear if 
> using a FD such as CX70.  Probably thinking 9 speed, will consider 10.  Any 
> advice appreciated.
>

I'm not sure what restrictions using Sugino OX601 cranks imposes on 
shifters. The issue is usually compatibility between the front derailleur 
and the STI shifters, since derailleurs have to accommodate the specific 
cable pulls of the STI shifters (unlike, for instance, the "stepless" 
actuation of Ergopowers or friction shifters). It's probably more useful to 
ask if the specific STI shifter you're thinking of will actuate a CX-70 
correctly, and the answer is maybe yes. I know that 10-speed "hidden cable" 
Ultegra STI shifters is a definite yes, but other STI shifters have 
different cable pulls. Nevertheless, there is a large fudge factor when it 
comes to adjusting front doubles, as it's essentially a binary system (OK, 
there's also a half-click), so it's highly likely it'll work.

Anyway, the other thing with a smallish 42-28 combo is getting the front 
derailleur low enough without having its cage hit the chainstay. Based on 
my Boulder All-Road (that has similarly large BB drop as your Roadini) 
that's running a 46-30 crank with a CX-70 front derailleur, I'll say you'll 
probably be fine, but it'll be close. If you really want to be sure, try 
the Gevenalle BURD front derailleur 
 (or this 
).
 
It's designed for smaller chainrings 
, cost about 
the same as a CX-70, and works with Shimano road shifters (although not 
sure which versions).

Finally, with regards to the biggest cog you can use, again, I'm not sure 
this has much relevance to what front derailleur you're using, within 
reason. Seeing that you've mentioned 9 and 10 speed, I'm guessing you won't 
be using the extra-large "dinner plate" 50T large cogs borne of the 1X 
revolution, and you're probably looking at a 36T low gear at the extreme. 
With the longish chainstay length that the Roadini has, that shouldn't be a 
problem at all. You may want to instead ensure your rear derailleur has the 
max gear rating for that 36T (or whatever you're thinking of), and enough 
chain wrap capacity for your entire drivetrain setup (shouldn't be too bad 
with a 14T differential double in the front).

Good luck!

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[RBW] Re: Crankset & STI Compatibility

[RDS]

Thanks for the info.  If someone has a FD suggestion that might work better let 
me know.

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[RBW] Re: Crankset & STI Compatibility

[Kevin Mulcahy]

I use a OX601 with 46/28 rings and Sram 10sp shifters. I use a Sram Red FD 
with the built-in chain keeper. 11-32 in the back. Works great!

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[RBW] Re: Crankset & STI Compatibility

[ted]

For big rings with fewer than 46 teeth I'd recommend either the Gevenalle 
BURD or the IRD Sub C front derailleurs
i.e. 
https://www.gevenalle.com/product/burd-front-derailleur/
or
http://www.interlocracing.com/shifters-derailleurs/sub-c-front-derailleur-double

The BURD FD has a shorter cage than the CX70 so it gives more chainstay 
clearance, which can be a problem with really small "big" rings.
I have BURDs on two bikes with small "big" rings and am very satisfied with 
them. The IRD Sub C has different aesthetics (more silver) which one might 
prefer. I have not used the Sub C but I presume it works as well as the 
BURD.

I don't know how well either of these work with STI brifters. One of my 
bikes has down tube shifters on it, and the other has SRAM double tap for 
the rear and a friction bar end for the front. I opted for the bar end 
because I was sure that would work well and I didn't know if the cable pull 
of the gevenalle and the SRAM brifter would be compatible. Also with the 
bar end I get easy trimming of the FD to avoid chain rub if needed. Though 
I liked the Campi 10sp brifters when I was using them I doubt I'd care for 
the STI or DoubleTap front shifting.


On Monday, October 21, 2019 at 4:15:46 AM UTC-7, RDS wrote:
>
> Thanks for the info.  If someone has a FD suggestion that might work 
> better let me know.

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