October 17, 2017 Login  


34x40 fun?
Last Post 07/26/2017 05:06 AM by Cosmic Kid. 36 Replies.
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longslowdistance

Posts:1472

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06/27/2017 08:23 AM
Not with Shimano - unless you go the di2 route, which I think is only 11 speed. $$$, but looks super slick, I hope I can try it someday.
With SRAM, mtb derailleurs are compatible with road shifters. So an option is to pony up for a right hand Sram 10 speed brifter and rear derailleur. If they have 2 x 10 stuff that works with 40 t cog.
Cosmic Kid

Posts:2146

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06/27/2017 08:47 AM
Yeah, 10 spd MTB stuff form Shimano used a different pull ratio, IIRC. Just did a very quick search for 105 SGS and seems to be the same issue, SS & GS versions only.

However, now that I think about it.....you might be able to frankenbike some stuff together. Specifically, use a 9 spd MTB RD, which, IIRC, was compatible with 9 speed road shifters. 9 speed and 10 speed road stuff was interchangeable, so using the old math theorem If A=B and B= C, then A = C, you should be able to run 10 spd road shifters with a 9 spd MTB RD long cage and get it to work.
Just say "NO!" to WCP!!!!
Cosmic Kid

Posts:2146

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06/27/2017 08:52 AM
Confirmed.....you can use a 9 spd Shimano MTB rear derailleur with 10 speed road STI shifters and have it work.

http://www.velonews.com/2011/01/bikes-and-tech/technical-faq/technical-faq-with-lennard-zinn-brake-questions-compatibility-and-new-years-feedback_155209

Think that will be your best option. I cannot find any Shimano road RD that will take a 40T rear cog.
Just say "NO!" to WCP!!!!
longslowdistance

Posts:1472

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06/27/2017 09:12 AM
There still is the issue of the mtb rear derailleur accepting a 40t cog rather than max 36t. I think my post was off because of this same issue.
If OC is looking for an excuse to go to 11 speed, this might be a good time.
Cosmic Kid

Posts:2146

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06/27/2017 10:02 AM
Hmmmm....didn't check that. So only 11 spd RD's will "officially" work with a 40T rear?
Just say "NO!" to WCP!!!!
Orange Crush

Posts:1995

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06/27/2017 10:46 AM
Thoughts on this? Realizing only now that this was part of setup, and in fact this is part that broke (sorry, this is well outside my bike tech nerd range):

https://www.wolftoothcomponents.com/collections/derailleur-optimization/products/roadlink

And yes, is does say that with 11-40 maximum front teeth difference support is 10 so I am outside that range.
Cosmic Kid

Posts:2146

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06/27/2017 01:28 PM
Seems like a viable solution....assuming you can live with the 10T differential up front.....so 44 / 34 to keep your 34x40 low gear option.

If you can live with 34x36, the 9 spd MTB solution seem like the easiest solution, though....and you could probably stretch it to a 38 (if they make such a combo).
Just say "NO!" to WCP!!!!
Gonzo Cyclist

Posts:568

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07/08/2017 11:12 AM
a buddy used a mix of Ultegra, and XT RD, using an XT 11-42 cassette on a drop bar adventure bike, works very well
Orange Crush

Posts:1995

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07/10/2017 11:20 AM
Thanks Gonzo. Given the short time frame I ended up rehabilitating the setup as is with roadlink derailleur extender. Worked perfectly for 240kms on the toughest terrain I have ever ridden. 15 hour ride (12 hour moving time), close to 150 kms of gravel, steep pitches, close to 5,000 m elevation, heat, forest fire smoke, you name it. Legs are fine, but my brain got fried, shaken and stirred. One one of the downhills I think I felt it bang against my skull. This was a journey to the edge of heat exhaustion and stubbornness. Must have gone through like 30 water bottles and a bunch of cokes. Would not have been possible without SAG support. 8 of 9 from team finished (about 30 overall at start; all hardcore), with one abandon due to forest smoke induced asthma. Ride report to follow sometime. For those on FB, see my page.

Oh and since the weekend involved a double purpose I ended driving about 1600 kms (detours around forest fires) to watch my kids soccer team become provincial champions. Two nights with only 4hrs sleep before and after the ride. I need a vacation.
79pmooney

Posts:1734

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07/10/2017 01:17 PM
Wow! Makes my Cycle Oregon challenge - doing it fix gear including the ~30 miles of gravel - look like a walk in the park. Spread out over 7 days to go 3 times as far and twice the elevation. Enough good sleep is easily done. I do hope I never see the brain frying, shaking and stirring. Not good for this brain at all, not with my LBS. (No, not the local bike shop. No, I've got NFL style Loose Brain Syndrome.)

Congrats, OC! And good work getting the bike dialed in. May mine serve me as well in 9 weeks.

Ben
longslowdistance

Posts:1472

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07/10/2017 01:59 PM
Wow, great story. Glad the gear issue got solved.
Orange Crush

Posts:1995

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07/10/2017 02:31 PM
I am not sure it was solved or dialed in but it seemed to hold up fine.

Definitely learned that when your riding lose sand and gravel on 32mm tires, there's no amount of gearing that will save you. You simply lose to much momentum in 34x40, better off using the 32 and trying to keep forward speed and balance but traction is still limiting factor. Need MTB size tires.

But on 20% hardpack the 34x40 is just dandy to spin it out to top and in 95% of situations you can keep riding.
Cosmic Kid

Posts:2146

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07/10/2017 03:13 PM
Posted By Orange Crush on 07/10/2017 11:20 AM
Thanks Gonzo. Given the short time frame I ended up rehabilitating the setup as is with roadlink derailleur extender. Worked perfectly for 240kms on the toughest terrain I have ever ridden. 15 hour ride (12 hour moving time), close to 150 kms of gravel, steep pitches, close to 5,000 m elevation, heat, forest fire smoke, you name it. Legs are fine, but my brain got fried, shaken and stirred. One one of the downhills I think I felt it bang against my skull. This was a journey to the edge of heat exhaustion and stubbornness. Must have gone through like 30 water bottles and a bunch of cokes. Would not have been possible without SAG support. 8 of 9 from team finished (about 30 overall at start; all hardcore), with one abandon due to forest smoke induced asthma. Ride report to follow sometime. For those on FB, see my page.

Oh and since the weekend involved a double purpose I ended driving about 1600 kms (detours around forest fires) to watch my kids soccer team become provincial champions. Two nights with only 4hrs sleep before and after the ride. I need a vacation.


Nothing about that sounds appealing....
Just say "NO!" to WCP!!!!
Orange Crush

Posts:1995

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07/10/2017 06:01 PM
It beats running for even just 5 minutes CK :-)

This in an older writeup from second year it was run, has some cool pics that tell story of what the ride is about.

http://www.7meshinc.com/7messages/the-ridden-word/the-hellracer-250/
Cosmic Kid

Posts:2146

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07/10/2017 09:14 PM
Hey, don't look at me to defend running....I only do it so I can still participate in a competitive sport.

On that note, set a PR last weekend in Muncie for a Half-Ironman by 12 min....went 4:47:10. Absolutely CRUSHED the bike, going 2:19 for 56 miles (24.1 avg) and then still ran my best ever run leg, going 1:41 (7:47 / mile pace). My previous best had been ~1:50 for the run.

Bike course was soooo fast, I was just flying. Ironically, I only ended up 5th in my AG, despite the new personal best. Some fast dudes were out there!
Just say "NO!" to WCP!!!!
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