Shimano 2x10 CX gearing limitations
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FSA AFTERBURNER MTB Bike Crankset + BB30 Compact Double 170mm 42/27T X-10s $96
https://www.amazon.com/AFTERBURNER-C.../dp/B015T3ZSRC
https://www.amazon.com/AFTERBURNER-C.../dp/B015T3ZSRC
A 104/64mm BCD crankset offers more options. Wolftooth has a 30 tooth ring for that bolt circle. Or, as I said above, you can shift the crank over and use a 104mm BCD ring of many different sizes and a 64mm BCD inner ring down to at least 22 teeth. You might even be able to use a 20 tooth ring, although it may not mesh properly.
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My situation is similar: Ultegra ten speed compact and looking for lower gears. I'm planning to get a Triplizer from IRD to turn my 48-34 into a 48-36-26(24). I will need to get a new RD -- probably a 9 speed Shimano MTB RD, but your long cage should be fine. You will need a new FD and a way to shift it. I'm using bar ends. For a cassette, I'll get an 11-36. Maybe overkill but ...
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Proprietary(ie untraditional) rings are all over the market. Shimano has cranks comin outta everywhere which require unique bcds and bolt #s
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The Wolftooth Roadlink (RoadLink ? wolftoothcomponents.com) would allow you to run an 11-40 cassette in the rear (look for Sunrace 10 speed 11-40 cassettes, they're very affordable) while retaining your Ultegra RD.
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Cheapest I found is the Sugino from Hubjub, ~2 bills delivered...
Sugino OX601D crankset
edit: It is a 10speed crank though...
Sugino OX601D crankset
edit: It is a 10speed crank though...
#31
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Probably little. How many people make chainrings that fit the Shimano XTR 146/102/64mm cranks? And how many different tooth counts can you get for those rings? How about an 86mm BCD? Can you find many of those? How about just about any 5 arm chainrings? How about a 94/58mm or 94/56mm compact ring? These were great cranks that could take an 18 tooth inner ring but you just can't find them now.
And, honestly, three chainring bolts haven't been used since about the days of cottered cranks.
Shimano does that occasionally so that they can sell more parts. The current standard of 4 bolt mountain bike cranks is because Shimano decided that they wanted to change everything. It does work but it's frustrating. There are still far more 4 bolt 104mm BCD rings out there in more sizes then anything else currently. For hmblmgnfcnt's application where he is still trying to figure out the gearing he wants, it's best to go with something for which there is a larger selection than hitch is bike to a proprietary BCD or odd chainring bolt pattern which has a very limited ring choice. Three ring bolt patterns may become all the rage next year but I wouldn't necessarily bet the farm on it.
And, honestly, three chainring bolts haven't been used since about the days of cottered cranks.
Shimano does that occasionally so that they can sell more parts. The current standard of 4 bolt mountain bike cranks is because Shimano decided that they wanted to change everything. It does work but it's frustrating. There are still far more 4 bolt 104mm BCD rings out there in more sizes then anything else currently. For hmblmgnfcnt's application where he is still trying to figure out the gearing he wants, it's best to go with something for which there is a larger selection than hitch is bike to a proprietary BCD or odd chainring bolt pattern which has a very limited ring choice. Three ring bolt patterns may become all the rage next year but I wouldn't necessarily bet the farm on it.
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Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
#32
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Yeah, this is like we are disagreeing, but really we arent...on the big point.
I agree there are a ton of obsolete bcds. A simple search and 10min of time will show that.
I just dont have as big an issue with it as you. I have mostly 110/74 triples and trust that rings for those will be around until only cockroaches roam the planet, so obsolete rings arent a big concern.
But i do have a crank now thats all fancy and 11sp. A compact cx double. I could simply buy a couple of extra rings now if i were scared they wont be around a handful of years from now.
Or, since rings are often times close to as much as a crank, i could buy a new crankset if i didnt want to invest now in a couple rings.
I just dont see chainrings wear out at such a high rate that it should be anything more than a sidenote when discussing options.
Ive found that those who will likely wear thru chainrings either know about it and have an idea of what they will do, or they buy a new crank. Heck, many people buy new cranks even when their current rings are still ok.
Parts for fork shocks from 20 years ago also arent always available. Tech changes and if you buy into the latest and greatest, buyer beware that it may not last.
I agree there are a ton of obsolete bcds. A simple search and 10min of time will show that.
I just dont have as big an issue with it as you. I have mostly 110/74 triples and trust that rings for those will be around until only cockroaches roam the planet, so obsolete rings arent a big concern.
But i do have a crank now thats all fancy and 11sp. A compact cx double. I could simply buy a couple of extra rings now if i were scared they wont be around a handful of years from now.
Or, since rings are often times close to as much as a crank, i could buy a new crankset if i didnt want to invest now in a couple rings.
I just dont see chainrings wear out at such a high rate that it should be anything more than a sidenote when discussing options.
Ive found that those who will likely wear thru chainrings either know about it and have an idea of what they will do, or they buy a new crank. Heck, many people buy new cranks even when their current rings are still ok.
Parts for fork shocks from 20 years ago also arent always available. Tech changes and if you buy into the latest and greatest, buyer beware that it may not last.
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I have a preference for stuff that just keeps working, even if it is a bit old. The photo is of part of a bike I built up this past winter, some of the parts are from the 90s and several of the parts were from a bike that I originally built up in 2004. The only thing that is slightly unusual when it comes time to replace is the Campy crank that uses 135mm BCD middle and outer chainrings. But they are still easy to find. This stuff is like the energizer bunny, it just keeps going, and going, and going, ... ...
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Thanks for the replies all. I took the easy road and ordered an 11-40 with roadlink for my ultegra setup. Riding cat 3&4 climbs in the rockies can run out my 11-32 cassette, so I'm thinking 2 extra cogs in back will help with a lil weight added. I'll report back once I get some seat time with that setup!
#35
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Being 10 cogs crammed into the space of 8 is itself a compromise ..
It's Not How Many Cogs You have but the gear ratio.. Do the Math ..
a 28: 36 not low enough ?, get off and Push.
Compass and White VBC cranks you can combine a 28 and a big ring of your choice
TA (old stuff 26t) ... a friend, on a tour in 85, had a 28-50 pair
./.
It's Not How Many Cogs You have but the gear ratio.. Do the Math ..
a 28: 36 not low enough ?, get off and Push.
Compass and White VBC cranks you can combine a 28 and a big ring of your choice
TA (old stuff 26t) ... a friend, on a tour in 85, had a 28-50 pair
./.
Last edited by fietsbob; 08-29-16 at 09:41 AM.
#36
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Planning to build a Straggler, and where I live is pretty hilly. What's my solution? A 26/36T crank and 11-42T cogset. 17.5 gear-inches at the bottom.
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Well, looks like I made the right call! Phew!
#38
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Have had Bikes And their riders, show up on the western coast having crossed the continent with the now Common 50-34 doubles
hauling their camping gear.
hauling their camping gear.
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Being 10 cogs crammed into the space of 8 is itself a compromise ..
It's Not How Many Cogs You have but the gear ratio.. Do the Math ..
a 28: 36 not low enough ?, get off and Push.
Compass and White VBC cranks you can combine a 28 and a big ring of your choice
TA (old stuff 26t) ... a friend, on a tour in 85, had a 28-50 pair
./.
It's Not How Many Cogs You have but the gear ratio.. Do the Math ..
a 28: 36 not low enough ?, get off and Push.
Compass and White VBC cranks you can combine a 28 and a big ring of your choice
TA (old stuff 26t) ... a friend, on a tour in 85, had a 28-50 pair
./.
Might have a 5" tire and attempt to ride up really steep MTB tracks
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Turning at 70rpm means moving at 11mph.
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I would imagine that having only 2 let alone only 1 chain-ring up front with a relatively high number in the back would amount to a lot of "cross-chaining".
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