# Thread: SL-R vs HD Head Angle - All things being equal

1. ## SL-R vs HD Head Angle - All things being equal

So all things being equal what is the HD's head angle vs SL-R? Let's say 150mm fork standard headset with HD in full 160mm mode.

2. All the various HA configurations are on Ibis' website/manual

3. Not all things being equal. HD quoted with 160 or 180 fork, HD140 with 150 and SL-R with 140.

4. Each 20mm in increased axle to crown height equals approximately one degree slacker head angle. You can back into each angle using this rough math. Bear in mind, different forks have different crown heights so a 36 160mm fox is not a 10mm increase over a 32mm 150mm fox, it is greater. You can find axle to crown heights for all forks searching this forum.

5. Iwan - 68.5 for the SL-R, 67.5 for the HD assuming a Fox 32 150 on the SL-R and Fox 36 @150 on the HD

Geometry calc app geometryCalc

-Shane

Originally Posted by Iwan
So all things being equal what is the HD's head angle vs SL-R? Let's say 150mm fork standard headset with HD in full 160mm mode.

6. Originally Posted by Iwan
Not all things being equal. HD quoted with 160 or 180 fork, HD140 with 150 and SL-R with 140.
Last time I checked the manual had HA by 10mm increments for all their models. Page 15 of the manual. Basically, every 10mm increase is about 0.5 degree, although HD 160 was about a degree.

It also depends on the fork you are using, as axle-to-crown measurements are different for each manufacturer. So you will have to adjust for that too.

7. Originally Posted by seleniak
Iwan - 68.5 for the SL-R, 67.5 for the HD assuming a Fox 32 150 on the SL-R and Fox 36 @150 on the HD

Geometry calc app geometryCalc

-Shane
Thanks. (For the answer and understanding the question! )

8. Originally Posted by seleniak
Iwan - 68.5 for the SL-R, 67.5 for the HD assuming a Fox 32 150 on the SL-R and Fox 36 @150 on the HD

Geometry calc app geometryCalc

-Shane
To further equalize, using Shane's numbers....

Using the same fork, pick the Fox 36 @150 on both the SL-R (140) and HD160:
68 for the SL-R, 67.5 for the HD160

And to further equalize with the same fork, and the same rear travel, the Fox 36 @150 on both the SL-R (140) and HD140:
68 for the SL-R, 67 for the HD140

..

9. Originally Posted by derby
To further equalize, using Shane's numbers....

Using the same fork, pick the Fox 36 @150 on both the SL-R (140) and HD160:
68 for the SL-R, 67.5 for the HD160

And to further equalize with the same fork, and the same rear travel, the Fox 36 @150 on both the SL-R (140) and HD160:
68 for the SL-R, 67 for the HD140

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•

# VISIT US AT

mtbr.com and the ConsumerReview Network are business units of Invenda Corporation

(C) Copyright 1996-2018. All Rights Reserved.