Do I have enough clearance to run this crank?
11-06-22, 12:04 AM
#1
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Do I have enough clearance to run this crank?
I want to change the crankset on my bike to a triple from 1x. Does this look like enough clearance. I already disposed the frame where I pulled the crankset from and did not think to take a picture.
Surly's website says the Bridge Club frame only fits 22 small chainring, but the small is a 26 here.
Surly's website says the Bridge Club frame only fits 22 small chainring, but the small is a 26 here.
11-06-22, 12:59 AM
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Kind of depends on what size the chainring is and how far out the 1x crank puts it. For chainline reasons, I would hope it puts it around where the middle ring is, and with that I would assume anything up to about the same size as that middle ring should clear.
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11-06-22, 07:41 AM
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It looks like plenty of clearance, but if not, you can resolve with a longer BB spindle. You'll have to think about that anyway to get the chainline right.
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11-06-22, 10:00 AM
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Any clearance is enough clearance. You're good to go as long as the chain line is OK.
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11-06-22, 11:58 AM
#6
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Originally Posted by FBinNY
Any clearance is enough clearance. You're good to go as long as the chain line is OK.
The crank is a Shimano Deore M591 which uses Hollowtech 2 bottom bracket. The frame bottom bracket is BSA 73mm, so I do not believe the chainline is adjustable.
11-06-22, 12:00 PM
#7
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Originally Posted by urbanknight
Kind of depends on what size the chainring is and how far out the 1x crank puts it. For chainline reasons, I would hope it puts it around where the middle ring is, and with that I would assume anything up to about the same size as that middle ring should clear.
11-06-22, 12:55 PM
#8
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Originally Posted by jsdavis
The crank is a Shimano Deore M591 which uses Hollowtech 2 bottom bracket. The frame bottom bracket is BSA 73mm, so I do not believe the chainline is adjustable.
Hollowtech II Bottom Brackets and Chainline
I'f I'm reading that correctly, it looks like at one time Hollowtech II cranks used shims for chainline adjustment. Dunno if they still do or not.
Maybe someone with more expertise with Hollowtech II can clarify?
11-06-22, 01:30 PM
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Originally Posted by jsdavis
The crank is a Shimano Deore M591 which uses Hollowtech 2 bottom bracket. The frame bottom bracket is BSA 73mm, so I do not believe the chainline is adjustable.
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“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
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WARNING, I'm from New York. Thin skinned people should maintain safe distance.
11-06-22, 01:37 PM
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If you already have the crank then I'm not sure why you don't just try it and see.
If you have the tools and the knowledge to change them out then it won't take you very long to find out for certain.
If you have the tools and the knowledge to change them out then it won't take you very long to find out for certain.
11-06-22, 01:52 PM
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Originally Posted by jsdavis
I'm actually going the other way. The bike came with a 1x12 system and it works ok, but chains and cassettes are very expensive, so I am putting a used 3x9 system from my old bike.
how many miles are you putting on it that chain and cassette replacement cost is an issue?
$45 for ultegra level 12 speed chain
Cassettes should last a lot longer than a chain but deore XT 10-51 are $165
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11-06-22, 02:39 PM
#12
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Originally Posted by squirtdad
I would save all the 1x12 stuff in case you don't find the 3x9 works as well as you hope.
how many miles are you putting on it that chain and cassette replacement cost is an issue?
$45 for ultegra level 12 speed chain
Cassettes should last a lot longer than a chain but deore XT 10-51 are $165
how many miles are you putting on it that chain and cassette replacement cost is an issue?
$45 for ultegra level 12 speed chain
Cassettes should last a lot longer than a chain but deore XT 10-51 are $165
I ride 4500 to 6000 miles or 7500-9500km per year on that bike and as my commuter and city bike.
11-06-22, 03:01 PM
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Originally Posted by jsdavis
Bike currently has is a Sram GX 12 speed with a 11-50 cassette so it needs Sram chain. Seems like the X01 is the better chain, but that costs about $70/chain. The only cassette that fits the wheel is Sram NX 12 speed and those are $110 each.
I ride 4500 to 6000 miles or 7500-9500km per year on that bike and as my commuter and city bike.
I ride 4500 to 6000 miles or 7500-9500km per year on that bike and as my commuter and city bike.
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11-06-22, 03:15 PM
#14
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I'd run it to Find Out... looks like it will be fine, if not a bit TOO offset to the outside... My favorite check is to place a straight piece of strap metal on the middle chainring's inner face then see where it meets up with the cassette... an easy and obvious to see test.
As to the question posed about Spacers and Hollowtech II bottom brackets... three 2.5mm spacer rings are supplied with most HTII 68mm bottom bracket assemblies...which are also sold as 73mm assys fairly frequently... ONE is used when the install is into a 73mm BB frame... i just completed an install into a SEVENTY mm frame! It took a couple test fits to find the right combo for that oddball... it was worth the effort.
As to the question posed about Spacers and Hollowtech II bottom brackets... three 2.5mm spacer rings are supplied with most HTII 68mm bottom bracket assemblies...which are also sold as 73mm assys fairly frequently... ONE is used when the install is into a 73mm BB frame... i just completed an install into a SEVENTY mm frame! It took a couple test fits to find the right combo for that oddball... it was worth the effort.
11-06-22, 03:27 PM
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Originally Posted by jsdavis
I'm actually going the other way. The bike came with a 1x12 system and it works ok, but chains and cassettes are very expensive, so I am putting a used 3x9 system from my old bike.
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