UltraBottom From 19.9g
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Tech info
Description
Lower headset stack, fits frame bore 34-41-42-44mm with 1-1/8 fork.
Enduro stainless bearing cartridge, angular contact, 2rs sealed and fully rebuildable,
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
