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Official Trek FX Thread

Old 03-20-23, 09:24 PM
  #2151  
smasha
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Originally Posted by t2p View Post
gravel bike or similar an option ?
Gravel bikes tend to be drop-bar, which tends to change the geometry. Perhaps more importantly, the only gravel-bike I can think of with a fork that would be good for a low-rider rack is the Giant Revolt, but that's a carbon fork.
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Old 03-22-23, 10:08 PM
  #2152  
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Well I got further with my 2020 Trek FX3 improvements...

I replaced the crankset with the M4100-2 to get the lower gear ratios. Had to shorten the chain for this, but no big deal. I haven't had a chance to ride this yet as we still have a ton of snow on the ground, but the weather has warmed up and I'm hoping in a week or so it'll be better.

So in looking at the rear shifting and why it appeared sluggish, I did get the Alivio M31000-R shifter. Someone else here in this thread mentioned it was snappier than the Acera, and I'd have to agree. But I also think I found the source of the issue I was having. The old shifter cables, as they went down below the bottom bracket cable guide, Trek had placed a short piece of inner housing liner, like 6" long or so. Anyway that liner was torn and was kind of jammed in there constricting the cable. I'm not entirely certain what the point of this was, I don't think it's needed. Anyway, after having done that I decided to just go ahead and also get the Alivio M3100-L shifter. That's a single lever shifter, also works really well.

I then looked at the front derailleur and wondered if I should upgrade that, but this is where my research gets weird. The current generation MTB like Alivio and Deore front derailleurs are side pull, which means the cable has to come from the front rather than the bottom. That's not how the cables route on the FX, so that was out. I looked at some older stock shifters, but eventually decided to just keep what I had. I had to lower it and realign everything and I got it working.

I went through the process of readjusting everything on the rear derailleur and it seems to be working really well right now. I'll have to check it again after riding it as the cable will likely loosen up a bit. But I want that snow gone.
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Old 03-23-23, 07:30 AM
  #2153  
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Originally Posted by MinnesotaSteve View Post
I then looked at the front derailleur and wondered if I should upgrade that, but this is where my research gets weird. The current generation MTB like Alivio and Deore front derailleurs are side pull, which means the cable has to come from the front rather than the bottom. That's not how the cables route on the FX, so that was out. I looked at some older stock shifters, but eventually decided to just keep what I had. I had to lower it and realign everything and I got it working.
I don't think you'd really gain anything by changing the front derailleur. You're right that you'd need a down-pull derailleur (or at least a dual-pull, capable of either top-pull or down-pull), but there really isn't much to the front derailleurs -- they're just a brute force mechanism to force the chain to certain chain rings. If you can get your current setup tuned so that you don't have much, if any, chain rub on the derailleur cage, then you're doing well and I'd leave it as-is.
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Old 03-23-23, 09:40 AM
  #2154  
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Originally Posted by hokiefyd View Post
I don't think you'd really gain anything by changing the front derailleur. You're right that you'd need a down-pull derailleur (or at least a dual-pull, capable of either top-pull or down-pull), but there really isn't much to the front derailleurs -- they're just a brute force mechanism to force the chain to certain chain rings. If you can get your current setup tuned so that you don't have much, if any, chain rub on the derailleur cage, then you're doing well and I'd leave it as-is.
Yeah, after I took the time to really dial in the front derailleur it's working very well.

I'm still curious why they had that liner in there. There was also one on the front shifter cable too, and it had also split, but hadn't torn and gummed it up.
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Old 03-23-23, 10:18 AM
  #2155  
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Originally Posted by smasha View Post
If it were that easy...

The big thing I'm looking for that's not fashionable on current off-the-shelf bikes is a 3x10 drive-train, with 40-30-22 crankset and 11-42 cassette. This gives me a gear ratio (from lowest gear to highest gear) of almost 700%, which lets me keep a comfortable cadence up and down hills, with or without panniers full of groceries. From a walking speed to +50kph, I can maintain a comfortable spinning cadence. Also, I like 170mm crank-arms, which I'm not going to find standard on any large-frame bikes.
(42-11) + (40-22) = 49T... I don't know if there are any rear derailleurs that can manage that. Looking at the specs they are like 45T capacity and max of 36 in the rear if running a triple. At that point, I'm not sure what 10 speed would gain you over classic 9 speed, you'd just lose that one gear, but 22/36 is still pretty good ratio. 9 speed stuff is extremely common, utterly compatible and bullet proof. That'd still give you quite a range. So anything new or used with 8/9 speed rear hub could be made to work.

Any of the Trek FX2 going back many years would work, if you can find the right bike. But they had alloy front forks with rack mounts.
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Old 03-23-23, 12:48 PM
  #2156  
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What's under the bottom bracket now that the liner is removed? Does it have a plastic cable guide that screws to the bottom of that housing? If so, you should be fine -- I presume they added a small section of liner for even smoother action, but that apparently aged poorly. Many bikes don't have the liner (they just have the plastic guide).
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Old 03-23-23, 03:25 PM
  #2157  
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Originally Posted by MinnesotaSteve View Post

So in looking at the rear shifting and why it appeared sluggish, I did get the Alivio M31000-R shifter. Someone else here in this thread mentioned it was snappier than the Acera, and I'd have to agree.
I remember a few years ago I did purchase Alvio M4000 shifters to replace the Acera M390's I had on my prior Specialize Crosstrail. I did notice a difference in the tactile feel, partly due to the better shifter and partly due to the Acera was kind of worn out already after a few years usage. Also remember liking that I could up shift 3 gears at time over single at a time on the Acera.

Noticed the specs on the Trek FX 3 Disc had the Acera M3000's. Always thought those were same or at least very similar to the Alivio M3000's, so interesting to hear it does have a different feel to em.
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Old 03-24-23, 09:36 AM
  #2158  
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Originally Posted by travbikeman View Post
I remember a few years ago I did purchase Alvio M4000 shifters to replace the Acera M390's I had on my prior Specialize Crosstrail. I did notice a difference in the tactile feel, partly due to the better shifter and partly due to the Acera was kind of worn out already after a few years usage. Also remember liking that I could up shift 3 gears at time over single at a time on the Acera.

Noticed the specs on the Trek FX 3 Disc had the Acera M3000's. Always thought those were same or at least very similar to the Alivio M3000's, so interesting to hear it does have a different feel to em.
Honestly, it could just be that the Alivio shifters came with optislick coated cables. But it does feel just a bit more solid.
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Old 03-28-23, 09:38 AM
  #2159  
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Originally Posted by MinnesotaSteve View Post
(42-11) + (40-22) = 49T... I don't know if there are any rear derailleurs that can manage that. Looking at the specs they are like 45T capacity and max of 36 in the rear if running a triple. At that point, I'm not sure what 10 speed would gain you over classic 9 speed, you'd just lose that one gear, but 22/36 is still pretty good ratio. 9 speed stuff is extremely common, utterly compatible and bullet proof. That'd still give you quite a range. So anything new or used with 8/9 speed rear hub could be made to work.

Any of the Trek FX2 going back many years would work, if you can find the right bike. But they had alloy front forks with rack mounts.
RD-M5120 is working well with this setup, on another bike. Specs say 2x, but no problems at all with a 3x.

If I could find a 3x9 crankset with a 20 or 22T low gear, I'd consider that, but the closest thing I could find was a 3x10 crankset. And I'm happy with how the 3x10 is working out on the other bike, so it'll be nice to be able to have spare parts that can fit two bikes.

Not a good idea to cross-chain it, but it's never a good idea to cross-chain, anyway. So maybe the caveat is that it works fine, when the gears are being shifted properly.

Last edited by smasha; 03-28-23 at 10:06 AM.
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Old 05-04-23, 06:59 PM
  #2160  
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NBD for wifey

Wife had a NBD today.
Trek FX 4

But what were Trek thinking when they stripped all the good Shimano stuff off the current FX4 ???
No more Shimano brakes, no GRX RD & Crankset. And what's with ditching Thru-axles for thru-skewers (whatever those are) ?

I did manage to find local shop that still had the prior model, and I grabbed that one.
Now to see if she'll let me install the Reserve 34/37 carbon wheels that came with my R5 on the Trek.
That'll lighten it up a bit more.


Barry
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Old 05-04-23, 07:02 PM
  #2161  
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Originally Posted by Barry2 View Post
Wife had a NBD today.
Trek FX 4

But what were Trek thinking when they stripped all the good Shimano stuff off the current FX4 ???
No more Shimano brakes, no GRX RD & Crankset. And what's with ditching Thru-axles for thru-skewers (whatever those are) ?

I did manage to find local shop that still had the prior model, and I grabbed that one.
Now to see if she'll let me install the Reserve 34/37 carbon wheels that came with my R5 on the Trek.
That'll lighten it up a bit more.


Barry
Could be supply chain issues?
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Old 05-05-23, 11:02 AM
  #2162  
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Originally Posted by Barry2 View Post
Wife had a NBD today.
Trek FX 4

But what were Trek thinking when they stripped all the good Shimano stuff off the current FX4 ???
No more Shimano brakes, no GRX RD & Crankset. And what's with ditching Thru-axles for thru-skewers (whatever those are) ?

I did manage to find local shop that still had the prior model, and I grabbed that one.
Now to see if she'll let me install the Reserve 34/37 carbon wheels that came with my R5 on the Trek.
That'll lighten it up a bit more.
I think that older FX4 Sport carbon you're looking at was kind of a oneoff, it was only made in 2021. In 2020 they were using an aluminum frame, and then in 2021 they introduced the carbon frame and a massive price increase. They'd been using Tiagra components on the Sports and that was the first one with the new GRX stuff. In 2022 they redesigned the carbon frame across the whole line and put GRX on the 5 and 6 instead of the road bike components. I think the new lineup probably makes more sense and is more consistent with differentiation going from the FX3 to the carbon line, although maybe they should have dropped the price on the FX4 to be more in between.. There's a big price jump from the Alivio components on the FX3 up to the GRX line. The GRX crank by itself is like $150. So I can see where they might want to use the Alivio line, and that prowheel crank to cut costs. Just not sure the carbon frame alone is worth the $800 increase over the FX3. Probably makes the FX4 not as good of a deal, like just stick with the FX3 or go for the FX5. If you can find an old FX4 Sport carbon on clearance, it's a really good deal.

And I really don't understand the Promax brakes though. The FX3 is spec'ed with MT201, and the FX5 has MT201... why use something different on the FX4 that is basically the same cost?

As for the Thruskew... yeah, I don't understand the thinking. I presume it was a way to get around adding "lawyer lips" to the fork. I actually prefer the old style QR though as it's a lot easier to use. Really not sure what value this adds, but thankfully I don't remove my front wheel that often.
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Old 05-05-23, 11:14 AM
  #2163  
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Originally Posted by MinnesotaSteve View Post
If you can find an old FX4 Sport carbon on clearance, it's a really good deal.
Sure did... FX4 with full Shimano/GRX/Thru-Axles, in a Wife acceptable Blue color!
If I'd been unable to find one with this spec, I'd be looking for a completely different bike.

Who wants a light weight carbon framed bike with cut-price components.... Nope
it makes no sense as a consumer, obviously the manu saves money, but they would not get my dollars for it.

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