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Suspension Fork on a Trek 520

Old 11-10-16, 02:46 PM
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Suspension Fork on a Trek 520

Is it possible, AND safe to do so? The 520 has 700's , what if I put a 26 up front?

Purpose: Intending to do a tour to the Arctic Circle, and I don't want to buy a new bike. Of course the 520 is durable enough for the trip, but the ride will not be as nice as my aluminum mountain bike with front suspension. Just a thought.
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Old 11-10-16, 02:53 PM
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A suspension fork on a 520? You could do that. My question would be why? Or rather, why not just tour on the mountain bike that already has the suspension...you kind of answered your own question there, actually.

As far as a 26" fork, don't do it...it will change the geometry of the bike drastically, and end up making it uncomfortable.

Just the humble opinion of a 520 rider who has never considered suspension necessary.
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Old 11-10-16, 03:12 PM
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If you were to use a suspension fork, I would figure a 29er fork would be best since 29er rim is the same as a 700c which is what you have now.

I saw a 520 with 42mm tires on it. Not sure if you could go wider, but if you could, that might be a possibility. 42mm or wider tire in the rear and a fat 29er up front on your suspension fork. Itll put some tilt back to your position since the 29er tire is taller than the 42.

Another option would be a large 27.5" tire and wheel up front. That would give you about the same overall size as your rear wheel and tire.


But this is all funky since it would be a suspension fork up front wonking up the geometry. Is your hardtail MTB something you could set up for touring?
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Old 11-10-16, 03:13 PM
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You will raise the head tube and Lower the head tube angle , Screwing up the Trail/steering specification A Lot..

Dual Sport?

Better still A Tout Terrain Silk Road [R'off or derailleur versions offered)



Note the gap over the mudguard, That is a Suspension corrected fork , (could fit a 29er wheel in there)
http://www.en.tout-terrain.de/bicycles/tanami/tanami/

Thorn, UK , is another One ..




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Old 11-10-16, 03:51 PM
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Another
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Old 11-10-16, 03:55 PM
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My mountain bike is a great riding bike, and would be fine for the trip. However, I would not be comfortable with the flat handlebars, would have to buy mud guards, rack, probably a generator, and so on.
I really like the 520, and I bought it for touring purposes, so maybe I'll just have to suck up the ride on the Dempster Highway. Quit complaining. I should remember that I am lucky to be able to go touring, and not have a job that I have to go to! Count my blessings. Thanks for the contributions guys!
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Old 11-10-16, 10:03 PM
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You should check out this guys writeup. He started out a circumnavigation of the Americas by riding up the Dempster Highway to Inuvik. He rode a custom touring bike similar to a 520. Kept very good records of equipment and replacements:
https://www.crazyguyonabike.com/doc/..._id=377064&v=6
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Old 11-10-16, 10:13 PM
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I'm posting this again because anytime I put in a link it must be approved by moderator and sometimes it takes forever.

You should google Jeff Kruys crazyguyonabike. He started out a circumnavigation of the Americas by riding up the Dempster Highway to Inuvik. He rode a custom touring bike very similar to a 520. Also kept very good records of places, services, equipment and replacements. Its a very good read as well.
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Old 11-10-16, 11:28 PM
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you could put a 26 up front, might even like the geometry change.
but then you need to carry double the spare tires.

they do make 700 suspension forks....
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Old 11-11-16, 01:19 AM
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Yeaaah no. What it would certainly do would screw up the geometry completely and the bike would likely handle like absolute crap
The worst case is that the change in head tube angle would cause too great a prolonged stress to the frame and would eventually rip the head tube right out of the down tube. Modern mtb's are built with these stresses in mind and the steel frames have gussets in critical high stress areas created by the slacker head tube angles.

Even the 26" forks are 490mm axle to crown whereas the 520 fork is 400mm maximum (Surly touring forks are 390mm). For reference MTB frame manufacturers specify a window of 40mm of acceptable travel change so +/- 20mm from the intended travel for the frame before you lose the warranty. This is with machines designed for the increased stresses of slack headtube angles.
In the case of the 520 you would be increasing the fork length with 90-100mm. That is HUGE! It is RIDICULOUS! Don't do it man.

This is of course with the level of suspension forks that are worth even considering (RockShox Reba and above). There are of course those clinky hybrid forks but... Well let's just say they are an abomination and a pestilence upon the cycling world. Don't go that way.
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Old 11-11-16, 09:54 AM
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Originally Posted by LuckySailor View Post
Is it possible, AND safe to do so? The 520 has 700's , what if I put a 26 up front?

Purpose: Intending to do a tour to the Arctic Circle, and I don't want to buy a new bike. Of course the 520 is durable enough for the trip, but the ride will not be as nice as my aluminum mountain bike with front suspension. Just a thought.
People seem to be missing the forest for the trees here. While you might be able to put a 29er fork on a 520, the frame isn't built to take the stresses that a suspension fork puts on it. About the shortest travel 29er fork you can find is a 100mm travel fork. That puts a lot of stress on the head tube/top tube/down tube junction. Mountain bikes have been designed to take the stress without breaking apart. Road bikes...even steel ones...aren't built to take those kinds of stresses.

Another thing to think about, you don't want to buy a cheap 29er fork...or cheap suspension fork of any kind...you want something that at least has a lock out so that you don't have to deal with the bike inchworming down the road when you don't need it. You also want a durable fork. None of that is cheap.

It would probably be cheaper to just add drop bars to your mountain bike and ride it. It would certainly be more up to the job if you feel you need suspension.
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Old 11-11-16, 11:04 AM
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2 guys from Sweden rode south from Anchorage , on step thru Commuter bikes with 622-42 Tires..

Leave the 520 as is.. just bring some spare tires.. and tubes obviously..
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Old 11-11-16, 11:08 AM
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Originally Posted by LuckySailor View Post
My mountain bike is a great riding bike, and would be fine for the trip. However, I would not be comfortable with the flat handlebars, would have to buy mud guards, rack, probably a generator, and so on.
I really like the 520, and I bought it for touring purposes, so maybe I'll just have to suck up the ride on the Dempster Highway. Quit complaining. I should remember that I am lucky to be able to go touring, and not have a job that I have to go to! Count my blessings. Thanks for the contributions guys!
Perhaps some butterfly/trekking bars for the MTB? That would give you a lot of good hand positions.
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Old 11-11-16, 04:42 PM
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Now here is the big question - if your travel will be so rough that you want a suspension fork, do you really think a 700c rear tire that is small enough to fit in your frame with fenders will be adequate on back for your trip?

My expedition bike was sold specifically with a frame that was designed to use a 100mm suspension fork or with the solid fork that came with it. It uses 26 inch wheels. I have used both types of forks on that bike. In the photo, my expedition bike had the solid fork installed. I found that 2.25 inch width (26 inch) tires were good enough for this road without having a suspension fork. It rode a bit rough, but I was really glad I had a heavy duty frame with wide tires. If it was rough enough that I felt that I needed the suspension fork, I really would not have wanted to have a 700c pavement touring machine.

When you said you could use 26 inch wheels, were you trying to ask if a 26 inch suspension fork would work on your 700c frame without messing up the geometry? Interesting question. And if you did that, would that mean a 700c on back and 26 inch up front? I do not know enough about frame geometry to have a clue, so I will not offer an opinion.

If you try a suspension fork, you might want to also order the lower headset bearing race to install on the other fork so you do not have to remove the race from one fork to install on the other. I did that when I bought my suspension fork, when I switch forks I am happy that I do not have to mess with the lower headset race since both forks have the race installed and are ready to swap in and out.
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Old 11-12-16, 11:55 AM
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I was thinking of something like this. It has only 30mm of travel, the axel center to crown measurement is 409, and mine is 405. The price is steep though, and I would have to put a disc in the front, which means I then loose my SON 28, and of course would have to build up a new wheel. Thanks for all the input. I will leave things the way that they are. When I built up my 520, it was meant to be taken everywhere, and that included the Dempster as that was on my mind at that time. Thanks again for your thoughts.

Lauf Grit | Lauf Forks - The lightest suspension forks on the market

And, something seems to have changed on the Forum, maybe I've just been away too long on my last trip, but how do I add a picture instead of a link? It keeps asking for a URL when I want to upload a picture.
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Old 11-12-16, 02:40 PM
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Photos, took me a while to figure it out.

Below the text box, click on "Go Advanced".

Then above the text box you get a bunch of icons, one of which is a paper clip. Click that.

That opens up a pop up window. YOu can click Browse to find your photo. It can't be too big, I am not sure the limit. And it will make your small photo even smaller.

And click on Upload to load your photos before you click submit reply, or before you click preview if you want to preview first.
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Old 11-13-16, 09:28 PM
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suspension fork on a Trek 520

Thanks Tourist. I did it a slightly different way....I think it worked
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Old 11-14-16, 08:06 AM
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Originally Posted by LuckySailor View Post
I was thinking of something like this. It has only 30mm of travel, the axel center to crown measurement is 409, and mine is 405. The price is steep though, and I would have to put a disc in the front, which means I then loose my SON 28, and of course would have to build up a new wheel. Thanks for all the input. I will leave things the way that they are. When I built up my 520, it was meant to be taken everywhere, and that included the Dempster as that was on my mind at that time. Thanks again for your thoughts.

Lauf Grit | Lauf Forks - The lightest suspension forks on the market

And, something seems to have changed on the Forum, maybe I've just been away too long on my last trip, but how do I add a picture instead of a link? It keeps asking for a URL when I want to upload a picture.
Interesting but...Damn! $900 for a springer fork!

And I'm not so sure about the effectiveness of the fork if the video is any indication. Look at about the 40 second mark where the rider makes the transition from gravel to pavement. The front tire almost bottoms out with the fork to about the same degree as the rear tire. The front tire deflection should be less, especially if you are going to spend $900 on a fork.
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Old 11-14-16, 08:46 AM
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Is something gonna break when you don't want it to? More parts usually means more stuff to break.
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