Worth it to preemptively pay extra for threaded BB option on new road bike?
Hi all,
On a new Ti road bike from Litespeed, I have the option to request at the time of purchase a T47 bottom bracket, which I understand is a threaded BB and the main reason I'd want to do this is to preemptively avoid a future press fit BB creaking issue that can happen over time. (Default bike comes with PF30 BB) (I am not super knowledgeable on this mechanical issue or religious about the BB topic as I gather some people are, but after reading/watching videos about it, I at least understand what the issue is). However, it's another $250 to get this option, and not to say I'm cheap but I don't feel like spending yet more on something if I'm not going to run into this problem for a long time. Or if it's cheaper to fix the problem when it does come up some day. Can you give me opinions about whether to go for this option? My current logic is, if it were so disadvantageous to have a press fit BB, why would bike manufacturers offer it? But maybe it's like printer cartridges, you pay less up front, but pay for it later. Thanks! |
There a few things getting mashed up here, so let’s start by saying No, it’s silly to pay extra for BSA.
Now, creaky BB is very unlikely to be a problem with a new Litespeed Ti frame because metal machining is accurate. Creaking is caused by imprecision in the BB bore spec, and is almost exclusively an issue in carbon fiber construction, and results pressfit BB’s cannot overcome it. Next, T47 is not a pressfit BB anyway, it’s threaded. The benefit of T47 is that it’s oversized, and better suited to making stiffer frames and fitting various crank spindle diameters. It’s better than BSA in this regard. Litespeed are saying, essentially, that they prefer to work to modern standards but will accommodate silliness if you pay them to do so. |
Originally Posted by chaadster
(Post 22580695)
...
Next, T47 is not a pressfit BB anyway, it’s threaded. The benefit of T47 is that it’s oversized, and better suited to making stiffer frames and fitting various crank spindle diameters. It’s better than BSA in this regard. Litespeed are saying, essentially, that they prefer to work to modern standards but will accommodate silliness if you pay them to do so. Not sure if I'm reading your reply right, maybe you can confirm, their using modern standards is the default option that comes with the bike, and paying them extra for the T47 is the silliness? This is what the spec of the bike says: "PF30 bottom bracket, with T47 bottom bracket upgrade available" |
There's no way in the world that I'd buy a new bike or frame set with ANY kind of press fit BB, AND, I wouldn't pay extra for a threaded one. Lynskey still builds with a BSA threaded BB and they don't charge extra for it.
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I am surprised the default is a PF. Would want a threaded BB, but the old standard BSA is fine. Is that an option??
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T-Lab does PF as well for their Ti bikes. I think I've heard that for them this accommodates the down and seat tube sizes/shapes better and more stiffness for the frame? Here's their comparison photo of pf vs BSA.
https://cimg2.ibsrv.net/gimg/bikefor...cdbbd520c3.jpg |
Nothing better than a PF vs threaded BB discussion. I accept that a properly done PF is viable, but it gets complicated in a hurry.
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T47 is likely the option because it's the same dimensions as BB30 or whichever it is, but threaded. This will let them do the same external welding, whereas BSA is smaller as seen above.
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It would cost less than 250$ to fix a creaking issue if you ever have one... Never personally had one so I can't tell, but servicing a BB is not that expensive. You could also very well have a creaking issue with a threaded BB...
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Originally Posted by supernova87a
(Post 22580679)
Hi all,
On a new Ti road bike from Litespeed, I have the option to request at the time of purchase a T47 bottom bracket, which I understand is a threaded BB and the main reason I'd want to do this is to preemptively avoid a future press fit BB creaking issue that can happen over time. (I am not super knowledgeable on this mechanical issue or religious about the BB topic as I gather some people are, but after reading/watching videos about it, I at least understand what the issue is). However, it's another $250 to get this option, and not to say I'm cheap but I don't feel like spending yet more on something if I'm not going to run into this problem for a long time. Or if it's cheaper to fix the problem when it does come up some day. Can you give me opinions about whether to go for this option? My current logic is, if it were so disadvantageous to have a press fit BB, why would bike manufacturers offer it? But maybe it's like printer cartridges, you pay less up front, but pay for it later. Thanks! |
Thanks, I'm back (morning) and just want to clarify for everyone reading, the default model comes with PF30, and is offering a T47 for $250.
I guess the cost of this is because they need to take an extra step to drill the precision threads and then measure, verify, rework it if needed (but still it feels like $200 more than I would expect). I mean, ok, every part bike related is $200 more than you expect... And I get that it's a nice insurance against future PF issues. I guess I'm on the fence about whether it's worth it. Even on my current bike I'm not that bothered by various hiccups/noises, but maybe with such a nice bike I'll start to get more discriminating! |
Originally Posted by Sy Reene
(Post 22580767)
T-Lab does PF as well for their Ti bikes. I think I've heard that for them this accommodates the down and seat tube sizes/shapes better and more stiffness for the frame? Here's their comparison photo of pf vs BSA.
https://cimg2.ibsrv.net/gimg/bikefor...cdbbd520c3.jpg |
I am a long time bike mechanic do my own work. I personally would avoid a bike with a press fit. It I still have the choice I am going BSA threaded BB without a doubt. My Habanero was almost 40k in and the original Shimano BB60r BB and 6800 cranks spin like a top without the chain. No creaks, no wobble, never had any maintenance. If the system is broken the don't fix it.
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Originally Posted by ThermionicScott
(Post 22581065)
That comparison is entirely irrelevant to this thread.
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BSA is not an option because they use the oversized BB shell. OP has the choice between PF30 and T47. That's it. Not sure why people keep bringing BSA into it. $250 seems like a massive amount of money just to put threading into the same shell that they were going to use anyway, but I have always had a thing for threaded as well.
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Not that this is an important consideration, but why would Litespeed do this? Just an upsell opportunity, given that people are willing to pay? I read into it, if they offer a standard PF by default, they deem it a good enough experience for their product, even if you do not buy the threaded option?
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Do you see yourself changing to different cranksets a lot with this new bike and DIY'ing them yourself?
If so, maybe the T-47 makes sense for you. However if you are just worried about all the doom and gloom that's gone around about pressfit, then you need to realize that more people don't have doom and gloom stories to tell. However the ones with negative experiences probably show up more to complain. Compared to just plain old stories of BB issues with any kind of BB, pressfit doesn't really seem to be a overwhelming majority of them. |
Originally Posted by Iride01
(Post 22581129)
Do you see yourself changing to different cranksets a lot with this new bike and DIY'ing them yourself?
If so, maybe the T-47 makes sense for you. However if you are just worried about all the doom and gloom that's gone around about pressfit, then you need to realize that more people don't have doom and gloom stories to tell. However the ones with negative experiences probably show up more to complain. Compared to just plain old stories of BB issues with any kind of BB, pressfit doesn't really seem to be a overwhelming majority of them. No, given that I have been relatively happy with my current old Trek 5500 bike for so long, and I"m not a diehard racer or bike mechanic myself, I doubt I would be upgrading my bike with every new possibility that comes out over future years. |
I would get the T47 and pay the loot. I looked at a Litespeed before I bought my Dpmane. I would have got the T47 in a heartbeat because how often are you getting a custom build like this. As it is my Domane has a threaded BB I went with a threaded BB on the mountain bike I ordered. I like being able to work on things easily and a press fit does not allow me to do that like a threaded BB does.
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Originally Posted by supernova87a
(Post 22581119)
Not that this is an important consideration, but why would Litespeed do this? Just an upsell opportunity, given that people are willing to pay? I read into it, if they offer a standard PF by default, they deem it a good enough experience for their product, even if you do not buy the threaded option?
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Sigh.. all current bottom brackets are press-fit. So even if you buy something threaded, the 2 cartridge bearings at the core of the BB have been press-fit into their BB shells. Even current BSA-threaded square taper bottom brackets are press-fit, as the carts are press-fit in.
I've worked on bikes since the 70's and have serviced hundreds of BBs. I have several bikes with the old (BSA, Italian and even French) threaded and several with the newer standards, of which BB86 is my favorite. BB30: not so much. If you select a frame builder with decent manufacturing tolerances, press-fit is fine for the life of the bike with zero issues, and overall it results in a lighter and stiffer solution. |
Originally Posted by supernova87a
(Post 22580729)
Thanks --
Not sure if I'm reading your reply right, maybe you can confirm, their using modern standards is the default option that comes with the bike, and paying them extra for the T47 is the silliness? This is what the spec of the bike says: "PF30 bottom bracket, with T47 bottom bracket upgrade available" In any case, it’s probably best for you to just go with whatever the standard Litespeed spec is. |
Originally Posted by Iride01
(Post 22581129)
...Compared to just plain old stories of BB issues with any kind of BB, pressfit doesn't really seem to be a overwhelming majority of them.
Originally Posted by Rdmonster69
(Post 22581185)
I would get the T47 and pay the loot. ... I like being able to work on things easily and a press fit does not allow me to do that like a threaded BB does.
Originally Posted by Bah Humbug
(Post 22581190)
I do assume they're comfortable with their default PF BB, ....
Originally Posted by Dave Mayer
(Post 22581191)
Sigh.. all current bottom brackets are press-fit. So even if you buy something threaded, the 2 cartridge bearings at the core of the BB have been press-fit into their BB shells. Even current BSA-threaded square taper bottom brackets are press-fit, as the carts are press-fit in....
If you select a frame builder with decent manufacturing tolerances, press-fit is fine for the life of the bike with zero issues, and overall it results in a lighter and stiffer solution. |
Originally Posted by Dave Mayer
(Post 22581191)
Sigh.. all current bottom brackets are press-fit. So even if you buy something threaded, the 2 cartridge bearings at the core of the BB have been press-fit into their BB shells. Even current BSA-threaded square taper bottom brackets are press-fit, as the carts are press-fit in.
. The Origin 8 and Shimano's I put in a few recent rebuilds meet that description. |
Originally Posted by Rdmonster69
(Post 22581366)
My Chris King BB was just a bunch of parts. Nothing look pressed in anywhere. There were 2 separate shells that threaded into the BB.
The Origin 8 and Shimano's I put in a few recent rebuilds meet that description. So your BB is press-fit. Similarly all current BBs are press-fit, regardless of maker or BB specification. A threaded BB setup does not prevent BB problems if either the threaded BB shell, or the BB itself is out of out of spec. I've seen several frames that were threaded out of spec, and rapid BB wear and creaking resulted. |
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