Barnetts Bicycle Repair Manual

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1
–
BASIC MECHANICAL SKILLS
ABOUT THIS CHAPTER
GENERAL TERMINOLOGY OF
BICYCLE PARTS.
THREADS.
PRESS FITS.
LUBRICANTS.
CLEANSERS AND POLISHES.
TOOLS.
!
"
"
& '
%
Top tube
Seat stay
Head tube
Seat tube
Chain stay
Down tube
Dropout
Fork
GENERAL TERMINOLOGY
OF BICYCLE PARTS
#
$
%
"
Bottom-bracket shell
Dropouts
(
)
$
1
–
1
1
–
BASIC MECHANICAL SKILLS
Front derailleur
!
& '
!
"!
*
Freew heel
Chain
Crankset
Rear de railleur
Chain
"
!
%
THREADS
THREAD IDENTIFICATION
+
+
$""
,-./ 0 12 34 0 3
5
" &67# 5'
"
&38'
5
! 5 5
67# &6 7
#' !
Hub
Spokes
Rim
Tire
1
–
2
1
–
BASIC MECHANICAL SKILLS
<=> <> & '
67# ! 9 : &9 '
"
5 ;
"
"
%
1.0
This 1.0mm gauge does not
match the thread
Correct (engaging knife edges)
This 2 6 tpi gauge (marked 2 6 G)
matches the thread
.9
0
.1
26G
.8
.2
.7
.3
.6
.4
0
1
.5
.5
.4
.6
.3
.7
"
?
&+?'
!
$ "
2
2
@A
; @
@
3-32
3-32
B"(
@AC 24
,D4/C ,D@/
1,-28/C ,-./
?
& 34
'
"
"
.2
.8
.1
0
.9
Correct (thread axis perpen-
dicular to caliper face)
Incorrect (thread axis paral-
lel to caliper face)
Incorrect (below knife edges)
.9
0
.1
.8
.2
.7
.3
.6
.4
0
1
.5
.5
.4
.6
.3
.7
.2
.8
.1
0
.9
Incorrect (in part of jaw that
doesn’t close fully)
Incorrect (knife edges of jaw
inserting in t hreads)
1
–
3
1
–
BASIC MECHANICAL SKILLS
$
5 18 12 3
" DFA
$
7
Left-hand
thread
Right-hand
thread
$
"
E
+
THREAD DIAMETER EQUIVALENTS
(table 1-1)
Approximate
Approximate
Nominal
measurement in
measurement in
fractional inch
millimeters
inches
thread diameter
7.7mm
.303"
5/16"
9.4mm
.366"
3/8"
12.5mm
.492"
1/2"
14.1mm
.555"
9/16"
25.2mm
.992"
1"
28.4mm
1.118"
1–1/8"
1.0mm
31.6mm
1.244"
1–1/4"
34.7mm
1.366"
1–3/8"
Start w ith a half-tooth out Tw o half-teeth out after
a half-turn rotation
Approximate
Approximate
Nominal
measurement in
measurement in
metric thread
inches
millimeters
diameter
.149"
3.8mm
4.0mm
.189"
4.8mm
5.0mm
THREAD TENDENCIES
- ?
67# &6 7 #' ;
5 7+ 7+
7 +* 7+ "
7+ 7
" 67# 7+
6 9
67# 7+ 6
767#7+
6
$
$ 7
7+6
7
67# 7+ $ 7
.228"
5.8mm
6.0mm
.307"
7.8mm
8.0mm
.351"
8.8mm
9.0mm
.346"
9.3mm
9.5mm
.389"
9.8mm
10.0mm
.976"
24.8mm
25.0mm
1.358"
34.5mm
34.7mm
1.370"
34.8mm
35.0mm
1.409"
35.8mm
36.0mm
+
& '
E
& '
G &
'
H
& 32'
1
–
4
1
–
BASIC MECHANICAL SKILLS
$ " 9
!
"
$
$
9 $
5 &
* '
7
7
<>
! $
" = 7
6
G 111
2
G 111 ( -
-
G
G 181 111
G 181 "
G 1A4
181
G 1A4
& '
"
G 1D1 1DD "
G E#2.4 1D1-1DD
G224&I;'
@
5
(
&# '
? &#
'
# &E
'
5
+? ?
?
!
PREPARATION AND ASSEMBLY
OF THREADS
G
#
)
+
B
=
"
G G
"
" "
G
G
G
G
G 7
6 7
1
–
5
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