Converting to Mullet

[Hello Ruan]

Hey everyone,

 

Well as per the title, I am looking at converting my 27.5 Cotic Rocket to a mullet bike and fitting a 29 wagon wheel in the front.

 

Why? I am not planning on getting rid of my Rocket anytime soon and I just want to experiment with it.

No! I am not the best when it comes to the more advanced technical levels of bicycle wizardry.
 

Yes! I have done some research online but to be honest, I just have a few very specific questions that I need answers to.

Questions:

Current 27.5 setup:

Frame: 150mm Fork: 150mm (just something about 1:1)

 

Okay, so I am looking at the following options for the mullet bike:

1. 29" wheel with 150mm fork

 

So, my understanding is that this setup will lift the front end and slacken out the bike by like 1.0-1.4deg but also bring up that BB height but not sure by how much like 5mm-8mm and seat angle will also change similar to the head angle amount.

 

2. 29" wheel with 140mm fork

 

140mm fork because wouldn't that keep the geo of the bike quite similar to what it is now? Catch here is, would the 150mm rear travel communicate well with the 140mm in the front? That is just the wrong way around and I don't like that makes me uncomfortable.

BUT! Get this:

So I am currently running a 150mm fork with my 27.5. The frame is designed around 150mm, 160mm and 170mm forks, intentionally so apparently not because you can just do it on most frames anyway + or - 10mm travel, not a breakthrough here.

So, if I do a 150mm 29 fork up in the front that would put me closer to the geo spec of the 170mm 27.5 fork, right?

 

Some fancy charts for geo referencing:

 

 

Looking at those charts, would 150mm 29" be very slack or like slack but not too slack? And going from my current geo to that geo would that feel very different or just slightly?

Thanks a lot for any and all feedback.

Edited July 14, 2020 by Hello Ruan

[ichnusa]

Interesting project! Keep us updated and send pictures...

 

Rather use crown to axle distance (not just fork travel) to compare apples with apples

[JacBrand]

I looked at putting a longer travel fork on my Cannondale Habit (120mm). I found this in the bike's spec document

The maximum fork length (from the fork crown to center of wheel axle). This I believe is the preferred design dimensions to keep the geometry of the bike to what it was intended to be.

 

Looking at the charts that you posted, it seems that the intended fork for your bike is a 160mm. I think you will be fine with a 150mm 29 er

[Fleming]

Will a 29in wheel fit in your current fork? You say you are running 27.5 wheels so I am assuming you have a 27.5 fork. I could be wrong though. There are a few exceptions where guys run 29in forks with 27.5in wheels.

 

If you can fit the bigger wheel in then I dont see a problem.

[Hello Ruan]

Thanks for the replies. I will be on the look out for a lekker 150mm 29 fork at a good price and update here whenever that might be.

[Chadvdw67]

Thanks for the replies. I will be on the look out for a lekker 150mm 29 fork at a good price and update here whenever that might be.

Saw a 160mm Lyrik on FB today for R7k

[Hello Ruan]

Saw a 160mm Lyrik on FB today for R7k

Well, it's not on bikehub so