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headset cover

compression ring

sealing

angular contact

bearing

angle cup

base plate

bike frame 

head tube 

angular contact

bearing

angle cup

english

5

insert angle cup

Apply a thin layer of grease to the insides of the 

bearing cups and then insert the bearings with the 

phase facing the cup. Then put the bearing cups 

together with the bearings in the frame. 

Important: 

The markings      on the bearing cups must point in 

the opposite direction. You can find a detailed 

explanation on the back of this manual.

angle headset (icr)

manual and product information

1

Clean the bearing seats and then apply a thin layer 

of grease.

clean and grease

max. 15mm

3

Tap the base plate in place with a suitable tool. You are 

finished as soon as the base plate sits flat on the fork 

crown.

mount base plate

4

Then generously coat the base plate with grease 

before you install the fork.

grease base plate

6

Guide the fork from below through the head tube until 

the base plate rests against the headset. Hold the fork 

in position and guide all other components onto the 

fork cone: centering ring, headset cover, spacer, stem. 

There must be 1-2 millimeters space between the upper 

edge of the steerer tube and the stem to preload the 

headset in the next step.

mount the fork

7

1-2mm

Now place the top cap on the stem, grease the head of 

the adjusting screw and turn it clockwise into the star 

nut. Tighten the screw only with 1.0 Newton meter. The 

stem screws must not be tightened at this point. Now 

pull the front brake with one hand. With the other hand 

grasp the head tube and the headset cover and move 

the bike back and forth. If you can feel play, tighten the 

adjusting screw slightly more. Repeat this process until 

you can't feel any play. Then align the stem correctly 

and tighten it according to the manufacturer's 

instructions.

adjust headset play

If not properly performed, assembly and maintenance work can 

cause accidents resulting in death or serious injury.
-Do not overestimate your technical ability. All assembly and maintenance      

  work shall be performed by a specialist workshop for bicycles. This is   

  the only guarantee of having this work done in a professional way.

-Use only acros genuine parts.

-Always keep your bicycle in a faultless technical state.

Danger of accident through a wrong riding mode.
-Use only the range of application for which your acros product is         

  designed for.

-When riding your bicycle you should always wear a new cycling   

  helmet of good quality (e.g. ANSI certified). Your clothing should be 

  close fitting, but not uncomfortable. For special types of use (e.g.   

  downhill) appropriate protective clothing is indispensable.

-Only ride your bicycle when you are in good physical condition.

-Don‘t jump with your bicycle – the forces created by such manoeuvres are   

  enormous and frequently cause serious accidents, which can result in death.

You should also rely on your common sense and avoid any 

unreasonable behaviour!

intended use

important safety information

Non-observance of the advice given in this manual can cause accidents 

resulting in death or serious injury.

Read this manual carefully before performing any necessary assembly 

and maintenance work. It is essential to read and observe all assembly 

and maintenance instructions, including those given in the manuals of 

other manufacturers whose products are used on your bicycle (frame, 

fork, stem etc.). Ensure that all other users of your bicycle carefully read 

this manual and observe the instructions.

Any use differing from the intended one can cause accidents result-

ing in death or serious injury.

steep head

angle

slack head

angle

2

assemble base plate

Clean the fork steerer at the lower end and apply a thin 

layer of grease. Then guide the base plate with the 

bevel pointing upwards on the steerer tube.

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