UltraBottom (tapered forks) From 25.3g
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Tech info
Description
Lower headset stack, fits frame bore44-51-52-55-56mm with 1.5' fork.
Enduro stainless bearing cartridge, angular contact, 2rs sealed and fully rebuildable,
includes additional fork spacer.
Model Finder
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
|
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
|
Straight Fork 1-1/8”
|
10.5mm
|
|
UltraTop 41
|
41mm
|
41.10-41.20mm
|
ZS41/28.6 |
|
13.5g.
|
Press Fit - Internal Cup
|
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
|
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
|
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
|
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
|
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
|
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
|
Straight Fork 1-1/8”
|
1mm
|
|
UltraBottom 44
|
44mm
|
43.95-44.00mm
|
| ZS44/30
|
23.8g.
|
Press Fit - Internal Cup
|
Straight Fork 1-1/8”
|
1.8mm
|
|
UltraBottom 44 T
|
44mm
|
43.95-44.00mm
|
| EC44/40
|
38.3g.
|
Press Fit - External Cup
|
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
|
Tapered Fork 1-1/8”-1.5”
|
1mm
|
|
UltraBottom 55
|
55mm
|
54.90-55.00mm
|
| ZS55/40
|
31.6g.
|
Press Fit - Internal Cup
|
Tapered Fork 1-1/8”-1.5”
|
2mm
|
|
UltraBottom 56
|
56mm
|
55.90-56.00mm
|
| ZS56/40
|
32.3g.
|
Press Fit - Internal Cup
|
Tapered Fork 1-1/8”-1.5”
|
2mm
|
* Consiering 3mm upper bearing insert - Maximum bearing insert 4.7mm
