#61
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But I wouldnt compromise anything else to get there. If your builder is using a chainstay yoke that will do a lot to get tire/chainring clearance. |
#62
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Yeah for sure, completely agree with you there. I am planning to keep my 425mm chainstay with 45mm tire clearance. We are definitely going to use a chainstay yoke in this case, which will clear 46T comfortably. My builder is just a bit unsure about 48T, we will test fit during the build. I was just surprised and never thought it would be a challenge given that carbon bikes can easily clear 50-52T chainrings + 425mm chainstay + 45mm clearance these days. But I guess metal tubing does not permit a more complex shaped chainstay like carbon does.
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#63
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Just got caught up on this thread; you're taking a really thoughtful approach to this and there's been a lot of great commentary and suggestions as well! I have a couple thoughts to add:
I'm also running a 46t front ring, but with an XPLR 10-44 cassette. I did consider the full mullet setup, but I found the gearing jumps a bit too big for my preference. I will say that I'm primarily riding on pavement or dirt roads, so I don't mind foregoing the low-low gears. Same as you did I picked my chainring based on what would keep me in the middle of the cassette most of the time. Forgive me if I've overlooked it, but have you considered a UDH rear dropout? I think that's a nice option for futureproofing, especially if you're going to be in the Sram ecosystem. I'll be following this thread more closely now; I'm working on a similar design and we've got similar fit goals. Let me know if you need to need to test fit/performance on any of our roads up here in VT - I'd be happy to show you around! |
#64
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Another option for you could be to use a boost (148x12) rear hub.
I dont know how much that really the other factors of the design, but it would allow you to push the chainring/chainline out 3mm and give you more clearance. Your wheelset would be an oddball @ 100/148 instead of 100/142, so you'd either have a pain upgrading or selling down the road, but its an option. |
#65
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Thanks mate! I will hit you up if I get a chance to go up that way this summer, definitely want to do some riding up that way for sure. Happy to chat/bounce ideas abt your build as well. I often find myself going in circle when thinking abt my build on my own so trying to bounce it off people here has been very helpful For a question I asked earlier in the thread, are you planning on T47 or BSA for your build? Quote:
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#66
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#67
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#68
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Its not quick swap, but, it also doesnt turn your wheelset into a paperweight if you upgrade either. |
#69
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That's a nifty trick. I haven't read up much on boost frame so will definitely read more into it to see if it makes sense here for me. Thanks so much for your insight.
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#70
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I’m in the pretty much the exact same boat as you with a custom build and I’m deliberating over the HT angle/fork rake and resulting trail. I feel your pain and understand you just want to get it right first time.
One would like to think that if you have had a conversation with the frame builder and given them a clear brief of what you want the bike to do then really they should be able to advise what will/wont work for your case use. I’m assuming you’re talking Firefly/Seven/Bingham/Desalvo etc then I think you can rest assured they’ll do their job and nail the brief. IMO I’d opt for the T47 bb shell. You can still fit a 24mm spindle crankset if needs be. |
#71
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Is there a particular reason why you favor T47? Most of the resources I have come across only mentioned the advantages of T47 when it comes to a carbon frame or Ti frame with full internal routing (for me hydraulic cable is routed outside of BB) |
#72
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The other benefit is flexibility - you can use everything from Shimano spindles to 30mm spindles. And retain a decent size bearing while you do it. Does that actually matter in practice? Not really.
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#73
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A few things - builders like them because it gives more surface at the BB to weld tubes to, making fabrication a little easier. They've become pretty commonplace on new bikes, so if/when you need a new one, it wont be hard to find say, a dub crank T47 BB. And long term, they're as future proof as you'll find for different cranks/groups.
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#74
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This ⬆️ |
#75
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Of course, it's probably a gamble either way given one cannot predict the future. I just wish that there was just one standard for BB to make life easier for everyone |
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