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Official Trek FX Thread

Old 07-17-21, 07:04 PM
  #1926  
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Originally Posted by Moisture View Post
Tire clearance and braking aside, is this frame well suited to 650 x 50 wheel/tires?
A disc brake frame would, sure. It'd be much more difficult (though not impossible) to convert a rim brake frame to a different wheel size. But if you have discs, then different wheel sizes are pretty easily swapped.
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Old 07-17-21, 08:40 PM
  #1927  
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Originally Posted by hokiefyd View Post
A disc brake frame would, sure. It'd be much more difficult (though not impossible) to convert a rim brake frame to a different wheel size. But if you have discs, then different wheel sizes are pretty easily swapped.
True, but assuming that braking and tire clearance is taken care of, would the bike work well with thicker tires?
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Old 07-18-21, 06:42 PM
  #1928  
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Originally Posted by Not2worried View Post
Thinking about changing out my stock pedals on my FX 2. How much of a difference are "upgraded" pedals?
Was looking at Race Face Chester pedals.
Thanks
I now have Chesters on all my bikes, except my FX3 disc. On those the shop had a knockoff at a third of the price that are high-vis yellow that I wanted to try. They are great also. Chesters are the best pedals I've ever had, when I don't want clipins. Which is almost always. I have Speedplay Frogs for when I want to use clipins with Mountain Bike shoes that I can walk anywhere in. But I seldom want clip pedals. No advantage to me. I have no interest in racing or pushing myself for "fast." Bicycles are not fast. Not after having a 145 mph Honda bike. That went fast.
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Old 07-19-21, 06:48 AM
  #1929  
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Originally Posted by Moisture View Post
True, but assuming that braking and tire clearance is taken care of, would the bike work well with thicker tires?
Sure! The bike frame itself doesn't really care how wide the tires are (other than clearance, obviously). Tire diameter changes will impact the frame's geometry somewhat, but those differences would be pretty minor. I've done swaps like this before -- like putting 47-584 tires on my Giant Roam which came with 38-622 tires...and it rode great. In fact, I liked it better in that configuration. But I do a lot of mixed surface riding where I prefer the larger air volume in the tires vs. a high pressure narrow tire on larger wheels. It'll depend on what you want -- but the FX will ride fine just the same.
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Old 07-19-21, 08:58 AM
  #1930  
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Originally Posted by hokiefyd View Post
Sure! The bike frame itself doesn't really care how wide the tires are (other than clearance, obviously). Tire diameter changes will impact the frame's geometry somewhat, but those differences would be pretty minor. I've done swaps like this before -- like putting 47-584 tires on my Giant Roam which came with 38-622 tires...and it rode great. In fact, I liked it better in that configuration. But I do a lot of mixed surface riding where I prefer the larger air volume in the tires vs. a high pressure narrow tire on larger wheels. It'll depend on what you want -- but the FX will ride fine just the same.
In my experience, you can deviate somewhat from stock tire diameters as long as there is no more than a 10mm difference front vs. Rear. Seems like trail is more negatively impacted when opting for a smaller diameter tire rather than vice versa.

I would definetely prefer thicker tires for my riding, but don't want to go much larger than the current tire diameter, especially since I would have to give up my rear fender.
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Old 07-19-21, 09:28 AM
  #1931  
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Originally Posted by Moisture View Post
Seems like trail is more negatively impacted when opting for a smaller diameter tire rather than vice versa.
Trail will decrease with a smaller tire diameter and increase with a larger tire diameter (all else being equal). Depending on what you want in a bike, you may prefer less trail or more trail. I generally prefer less trail, but that's a very personal preference (and trail is certainly not the only metric that defines how a bike rides).

Originally Posted by Moisture View Post
I would definetely prefer thicker tires for my riding, but don't want to go much larger than the current tire diameter, especially since I would have to give up my rear fender.
If you're moving down to 584mm wheels (27.5"), you shouldn't have a problem with overall tire diameter. If you have 35-622 tires now, those are nominally 692mm in diameter. If you're looking for a street-oriented tire in 584mm wheel size, you'll generally find them in the 47-50mm width, which would nominally be between 678mm and 684mm in diameter. You may find that your current fenders aren't quite wide enough for tires that wide.
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Old 07-20-21, 08:16 PM
  #1932  
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Originally Posted by hokiefyd View Post
Trail will decrease with a smaller tire diameter and increase with a larger tire diameter (all else being equal). Depending on what you want in a bike, you may prefer less trail or more trail. I generally prefer less trail, but that's a very personal preference (and trail is certainly not the only metric that defines how a bike rides).



If you're moving down to 584mm wheels (27.5"), you shouldn't have a problem with overall tire diameter. If you have 35-622 tires now, those are nominally 692mm in diameter. If you're looking for a street-oriented tire in 584mm wheel size, you'll generally find them in the 47-50mm width, which would nominally be between 678mm and 684mm in diameter. You may find that your current fenders aren't quite wide enough for tires that wide.
By low trail, how low are we talking about?

I think that the way the frame is assembled and the way the tubing is butted can easily make the trail feel different. At least this certainly is what I observed with my Trek over my old Nishiki road bike. Both seem about equally stable in a straight line or at speed, but the trek walks all over the old road bike in terms of agility. I think that the Nishiki may have had slightly less trail. My trek is @ 62mm which isn't exactly low, at least not for a bike designed primarily for use on pavement.

My current fork has an offset of 45mm. I am thinking of updating to a fork with slightly more offset to lower the trail a little.

If I understand correctly, is head tube angle mainly responsible for stability at speed, while fork offset determines agility at lower speeds? How would a bike with a steep head tube and low fork rake behave?
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Old 07-21-21, 06:09 AM
  #1933  
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Terms "low" and "high" are subjective enough to where comparisons are hard to make. I've found that high trail and/or high wheel flop increases 'self steer', the tendency for a bike to want to keep steering into the turn without user input. Most "road bikes" are in the 55-65mm range for trail (though anyone could argue a different range depending on how you define the "road bike" segment). Gravel bikes and bikes designed for looser surfaces often have slightly more trail, maybe 70-80mm (dual sport hybrids often fall into this range). Mountain bikes often have trail even higher than this. I once had a Giant ARX that had about 100mm of trail. It drove so strangely that I returned it. I just didn't like how it rode. My lowest trail bike is a 1970 Peugeot mixte. It has a pretty steep head tube angle (something like 73 degrees) and a fork with a very high offset (something like 55-60mm). So the trail is somewhere in the 40s. That's one of my more fun bikes to ride. Not from a speed perspective, but from a more fundamental "this bike is enjoyable to drive" perspective. My Trek MultiTrack 750 has something like 65mm of trail and it's also very enjoyable to ride.
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Old 07-21-21, 08:18 AM
  #1934  
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Originally Posted by hokiefyd View Post
Terms "low" and "high" are subjective enough to where comparisons are hard to make. I've found that high trail and/or high wheel flop increases 'self steer', the tendency for a bike to want to keep steering into the turn without user input. Most "road bikes" are in the 55-65mm range for trail (though anyone could argue a different range depending on how you define the "road bike" segment). Gravel bikes and bikes designed for looser surfaces often have slightly more trail, maybe 70-80mm (dual sport hybrids often fall into this range). Mountain bikes often have trail even higher than this. I once had a Giant ARX that had about 100mm of trail. It drove so strangely that I returned it. I just didn't like how it rode. My lowest trail bike is a 1970 Peugeot mixte. It has a pretty steep head tube angle (something like 73 degrees) and a fork with a very high offset (something like 55-60mm). So the trail is somewhere in the 40s. That's one of my more fun bikes to ride. Not from a speed perspective, but from a more fundamental "this bike is enjoyable to drive" perspective. My Trek MultiTrack 750 has something like 65mm of trail and it's also very enjoyable to ride.
Can absolutely agree with you on trail being very subjective.... not to contradict what i just said, as this helps to put handling metrics into perspective... but wouldn't a trail of around 65mm seem normal for a gravel bike as well? I see plenty of gravel bikes with a very similar angles to the trek fx - 72.5 head angle and roughly 45mm of fork offset.

Do you think that changing out to a chromoly or carbon fork with about 50mm of offset would be a worthwhile decision? My current fork is aluminum, nothing wrong with it.. just thinking I might prefer something better with road buzz. I've heard stories of carbon forks cracking though.
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Old 07-21-21, 11:05 AM
  #1935  
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Originally Posted by Moisture View Post
Can absolutely agree with you on trail being very subjective.... not to contradict what i just said, as this helps to put handling metrics into perspective... but wouldn't a trail of around 65mm seem normal for a gravel bike as well? I see plenty of gravel bikes with a very similar angles to the trek fx - 72.5 head angle and roughly 45mm of fork offset.
I think gravel bikes generally have a slacker head tube angle than traditional road bikes and a bit more trail.


I think this is a pretty good video on the topic.

Originally Posted by Moisture View Post
Do you think that changing out to a chromoly or carbon fork with about 50mm of offset would be a worthwhile decision? My current fork is aluminum, nothing wrong with it.. just thinking I might prefer something better with road buzz. I've heard stories of carbon forks cracking though.
That's tough to say. I'd probably like it myself. I usually like steel stuff, and recently swapped a cheap Suntour 80mm suspension fork on my entry level hardtail for a Surly chromoly fork (ECR 27.5+ model). The axle-to-crown measurement was shorter, but it has the same offset...so it increased the head tube angle and decreased the trail. I think the bike rides better this way...no-handed riding is much easier and the bike feels more natural in general. But again, I'm not into the slack geometry popular today and prefer more "traditional" bike geometry. So I'd probably like your proposed change.
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Old 07-21-21, 06:57 PM
  #1936  
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What are the widest tires you can put on an FX2?
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Old 07-22-21, 08:55 AM
  #1937  
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how different is the riding experience in between the trek fx and fx sport versions?
I notice the fx sport is longer reach, but it also has a higher stack.
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