2 tech questions (Trek Superfly 100 AL)

[NotSoBigBen]

So as usual I'm busy with a build project (more on that in a dedicated thread [emoji12]) and have 2 questions

 

Frame - Trek Superfly 100 AL

 

1) the standard rear shock is a Fox RP2 185x45 ... What effect would using a DT Swiss 190x50 have? As always I have the shock so using it would be great as it would mean less spend. Use as a training bike, some intermediate technical but mostly long endurance type riding if that helps

 

2) it uses a standard looking rear QR but it's longer than normal as per the attached picture. STD is 165mm in length with 23mm thread, the Trek one is 198mm in length with 30mm thread. Could one make one up in some way? I'm thinking remove the normal QR part from an existing skewer (should that be possible?) get the correct length and diameter piece of 'rod' and thread it and insert ...

 

Of course now if someone has one laying around [emoji41]

 

Would highly appreciate some advice.

Edited July 7, 2020 by NotSoBigBen

[BaGearA]

For the first question, using a longer shock will increase the head and seatube angles.

 

Of there is a Brace in the rear triangle between the shock and seat tube it might contact the seat tube and this is bad

 

Using a longer stroke shock could cause the frame to touch the seatube on the back if there is a brace in the rear triangle between the wheel and rear of the seat tube

 

 

Short answer : Don't do it

 

 

*if you get away with it it will only be just and the angles will be woerd and the bike will be operating in ways it was not designed for in the first place.

 

Of you don't get away with it you can cause some very serious frame damage which will likely end in you throwing away the frame or having it repaired at great cost to only be where you are right now.

 

No comment on second question

[NotSoBigBen]

For the first question, using a longer shock will increase the head and seatube angles.

 

Of there is a Brace in the rear triangle between the shock and seat tube it might contact the seat tube and this is bad

 

Using a longer stroke shock could cause the frame to touch the seatube on the back if there is a brace in the rear triangle between the wheel and rear of the seat tube

 

 

Short answer : Don't do it

 

 

*if you get away with it it will only be just and the angles will be woerd and the bike will be operating in ways it was not designed for in the first place.

 

Of you don't get away with it you can cause some very serious frame damage which will likely end in you throwing away the frame or having it repaired at great cost to only be where you are right now.

 

No comment on second question

Thanks, will start a quest to find the correct shock at a reasonable price!

[madmarc]

I have a TREK Superfly 100 carbon hanging in my garage - sadly the frame snapped on the seatpost just above the FD mount, after many years and km's of riding. I did various upgrades on the bike over the years, most the components of which I think are stored in a box somewhere in my mancave.

 

I also wanted to replace the rear shock for something better, after many hours of research and speaking to to the guys at FOX the standard shock on these Superflys were actually good shocks, they are also setup specifically by FOX for the Superfly and getting a direct replacement of another brand will be difficult. Also as BaGearA already said, you will change the geometry of the bike and run the risk of damaging the frame - Don't do it. 

 

The rear triangle design has pivots where the chainstay and seatstay join at the dropouts so the outside face to face dimensions where the skewer clamps are wider than normal and hence the longer skewer is needed. 

 

Instead of trying to build a new skewer buy the proper part from TREK. There is also an upgrade kit for the Superfly so it can be converted to take a 142 X 12 Maxle - This was one of the first upgrades i did to try make the rear a bit stiffer. I would rather take this route than spending money on a new standard skewer. The kit comes with new dropouts and pivot spacers, the RD side dropout has the hanger intergrated into the dropout - fairly easy and quick to install

[NotSoBigBen]

I have read that one can also buy the 200mm skewers used for some trainers and it'll work ...

[Wayne pudding Mol]

I have read that one can also buy the 200mm skewers used for some trainers and it'll work ...

I will get in touch, I may have one.  Will look in the cave later and PM you

[NotSoBigBen]

I will get in touch, I may have one. Will look in the cave later and PM you

Thanks a stack!

[Wayne pudding Mol]

Thanks a stack!

too short, sorry Ben

[NotSoBigBen]

too short, sorry Ben

No worries, thanks for looking!

[NotSoBigBen]

Some feedback, managed to source a shock, on its way via Postnet.

 

Having my welder mate fashion a 200mm skewer out of 2 normal ones.

 

Another problem has cropped up though, needs a 36.4 seatpost clamp, been to all my local suppliers nothing [emoji849] - called most of the nearby shops nada ...