UltraTop from
14.7g.
UltraBottom
from
19.9g.
Hidden weightsavers
Weight: see table
Stack Height: see table
Sealing: 4 RSeals + O-Rings
Specials: HyperCap & UltraStar4 included
Upper Bearing: Radial micro cartridge or Stainless bidirectional cartridge
Standards: 1-1/8" straight forks and 1-1/8"-1.5" tapered forks (see table)
Lower Bearing: Stainless bidirectional cartridge
Finish: black anodized
Graphics: laser etched
Extremely light and easy to configure on virtually any frameset.
How to find
your model
Precisely
measure exact bore diameter of your upper and lower headtube with a digital
caliper.
Then look at the "Head tube Bore" column on the chart below and find the correspondent model.
|
Model
|
Head
tube bore
|
Tolerance
|
SHIS
|
Weight
|
Headset
style
|
Manual
|
Fork
standard
|
Stack
Height
|
|
UltraTop
34
|
34mm
|
33.90-33.95mm
|
EC34/28.6
|
|
15.6g.
|
Press
Fit - External Cup
|
Straight
Fork 1-1/8”
|
8mm
|
|
|
UltraTop
34 HD
|
34mm
|
33.90-33.95mm
|
EC34/28.6
|
|
29.5g.
|
Press
Fit - External Cup
|
 Manual |
Straight
Fork 1-1/8”
|
10.5mm
|
|
UltraTop
41
|
41mm
|
41.10-41.20mm
|
ZS41/28.6
|
|
13.5g.
|
Press
Fit - Internal Cup
|
Manual |
Straight
Fork 1-1/8” or
Tapered Fork 1-1/8”-1.5” |
5.6mm
|
|
UltraTop
42
|
42mm
|
41.95-42.05mm
|
ZS42/28.6
|
|
13.8g.
|
Press
Fit - Internal Cup
|
Manual |
Straight
Fork 1-1/8” or
Tapered Fork 1-1/8”-1.5” |
5.6mm
|
|
UltraTop
41-42 HD
|
41
to 42mm
|
41.00-42.50mm
|
IS42/28.6
| or
IS41/28.6 | |
22g.
|
Integrated
- Top
|
Manual |
Straight
Fork 1-1/8” or
Tapered Fork 1-1/8”-1.5” |
4.2mm*
|
|
UltraTop
44
|
44mm
|
43.95-44.00mm
|
ZS44/28.6
|
|
14.7g.
|
Press
Fit - Internal Cup
|
Manual |
Straight
Fork 1-1/8” or
Tapered Fork 1-1/8”-1.5” |
5.8mm
|
|
UltraTop
44 HD
|
44mm
|
43.95-44.00mm
|
ZS44/28.6
|
|
25.4g.
|
Press
Fit - Internal Cup
|
Manual |
Straight
Fork 1-1/8” or
Tapered Fork 1-1/8”-1.5” |
5.5mm
|
|
UltraBottom
34
|
34mm
|
33.90-33.95mm
|
|
EC34/30
|
30.3g.
|
Press
Fit - External Cup
|
Manual |
Straight
Fork 1-1/8”
|
9.5mm
|
|
UltraBottom
41-42
|
41
to 42mm
|
41.00-42.50mm
|
|
IS41/30 or
| IS42/30 |
19.9g.
|
Integrated
- Bottom
|
Manual |
Straight
Fork 1-1/8”
|
1mm
|
|
UltraBottom
44
|
44mm
|
43.95-44.00mm
|
|
ZS44/30
|
23.8g.
|
Press
Fit - Internal Cup
|
Manual |
Straight
Fork 1-1/8”
|
1.8mm
|
|
UltraBottom
44 T
|
44mm
|
43.95-44.00mm
|
|
EC44/40
|
38.3g.
|
Press
Fit - External Cup
|
Manual |
Tapered
Fork 1-1/8”-1.5”
|
10mm
|
|
UltraBottom
51-52
|
51
to 52mm
|
51.00-52.50mm
|
|
IS51/40
or
| IS52/40 |
25.3g.
|
Integrated
- Bottom
|
Manual |
Tapered
Fork 1-1/8”-1.5”
|
1mm
|
|
UltraBottom
55
|
55mm
|
54.90-55.00mm
|
|
ZS55/40
|
31.6g.
|
Press
Fit - Internal Cup
|
Manual |
Tapered
Fork 1-1/8”-1.5”
|
2mm
|
|
UltraBottom
56
|
56mm
|
55.90-56.00mm
|
|
ZS56/40
|
32.3g.
|
Press
Fit - Internal Cup
|
Manual |
Tapered
Fork 1-1/8”-1.5”
|
2mm
|
* Consiering 3mm upper bearing insert - Maximum bearing insert 4.7mm
HD
(Heady Duty) Versions feature 2 stainless bidirectional bearing cartridges
that
can handle double crown forks and manage DH abuses.
Stainless and fully serviceable.
UltraTop come with HyperCap and UltraStar4 included for a complete and ultimate headset assembly (add 7.6g total).
Improvements
are on every single element of our original parts.
Reduced stack dimensions allow more efficient bike layouts.
Slimmer,
lighter and trickier: a real concentrate
of Extralite's high-quality engineering.
Japanese
MX design shows since decades how to divide functions between steering loads:
lighter
upper bearing (radial only) and a lower bidirectiona bearing.
This
tricky layout reduces weight and improves your race trim minimizing headset
stack height.
Warning:
UPPER RADIAL MICRO BEARING are suitable for x-c single crown or road forks only.
UPPER RADIAL MICRO BEARING CANNOT HANDLE UPSIDE-DOWN LOADS/SHOCKS/nor twin-triple clamp forks.
If you have a twin-triple clamp fork and/or you are willing to stunt your bike choose upper stack in HD version.
Need to install a straight 1 1/8" fork onto a tapered 1 1/2" frame?
See ExtraBolt 16
100% made in Italy