1. Seat Tube angle

How does it effect the geometry of a bike?
I am considering offset bushings for my SC Tallboy to slacken the head tube a bit.
It will also slacken the seat tube which by my understanding doesn't have to be necessarily a good thing.
I have also noticed the trend in progressive geometry to go with steep ST angles.
So, how is it going to change my ride?
Offset bushings - Anything else I should be aware off?

2. Seat Tube angle

Originally Posted by jazzanova
How does it effect the geometry of a bike?
I am considering offset bushings for my SC Tallboy to slacken the head tube a bit.
It will also slacken the seat tube which by my understanding doesn't have to be necessarily a good thing.
I have also noticed the trend in progressive geometry to go with steep ST angles.
So, how is it going to change my ride?
Offset bushings - Anything else I should be aware off?
You will need to move your saddle forward to keep the same position over the pedals, and this shortens your reach to the bars, which may require a long stem, which moves your weight more towards the front wheel...

3. Re: Seat Tube angle

Thanks Shiggy.
Do you know how much adjustment in the seat position we are talking about?

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4. Seat Tube angle

Originally Posted by jazzanova
Thanks Shiggy.
Do you know how much adjustment in the seat position we are talking about?

Sent from my PG86100 using Tapatalk 2
Depends on the amount of change.
Measure before and after. Adjust to match.

5. Originally Posted by shiggy
Depends on the amount of change.
Measure before and after. Adjust to match.
This is the easiest way or you can bust out a calculator and do some trigonometry.

Make a triangle between your saddle and bottom bracket with the existing known seat tube angle and height difference, adjust the angle and see how far your saddle moves back with the slacker STA.