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MEL'S TECH TIPS

How to Measure:
Chain Ring Bolt Pattern Seat Post Steer Tube
for a Front Derailleur Hubs Rear Dropout 
     
    
How to measure your chainring bolt pattern
Mel's Tech Tips shows how to measure your chainring bolt pattern
The 2 most common bolt patterns are:
 110 Bolt Pattern = 65mm center to center (actually 64.7mm)
130 Bolt Pattern = 77mm center to center (actually 76.4mm)
 
 
ANOTHER CHAINRING TECH TIP
Chain Ring Dimensions (all 5 bolt)
Bolt
Diameter
Hole Center
to Hole Center
Crank Compatibility
74mm 43.5mm Inner third ring
86mm 50.5mm  
110mm 64.7mm Sugino, Sakae/Ringyo (SR), Avocet, Specialized, Shimano Deore, A few OEM cranks
118mm 69.4mm Stronglight 99, Sakae/Ringyo (SR) 5TG, All 3 rings
130mm 76.4mm 2 outer rings, Shimano, Dura Ace, 105, FSA, Sram,
1987 & later
144mm 84.6mm Now a standard bolt pattern: Campy, N.R., Mighty, Compe,
SR-5LA, Superbe & Cyclone Pre 1987
 
    
How to measure your seat post
Remove your seat post from the frame then take a rag and clean off all dirt and crud so you can read the numbers. Check size using caliper tool. If you don't have a caliper tool, you can always use a "poor man's" caliper by taking an adjustable wrench and use it like a vernier caliper. Once the wrench is open to the correct size, measure the opening with a metric ruler.
click on image to enlarge
Mel's Tech Tips shows how to measure your seat post  Mel's Tech Tips shows how to measure your seat post  Mel's Tech Tips shows how to measure your seat post 
Remove and clean seat post  Check size with a
Park Tool DC-1 caliper tool
(see cost on our tools page)
Check size with a
"Poor Man's Caliper"
(adjustable wrench)
 
    
How to measure your fork steer tube
click on image to enlarge
Mel's Tech Tips shows How to measure your fork steer tube 
Measuring a Steer Tube at 28.4mm means 1 1/8" standard threaded head set. Note: inside of steer tube has a star nut (aka star fangled nut) pressed in to hold the fork together to the stem. 
 
    
How to measure for a front derailleur 
click on image to enlarge
Mel's Tech Tips shows How to measure for a front derailleur   Mel's Tech Tips shows How to measure for a front derailleur  
Measuring for a front derailleur, this example measures 28.7mm and will utilize a 28.6mm (or 1 1/8") clamp. 
 
    
How to measure your hubs
click on image to enlarge
Mel's Tech Tips shows How to measure your hubs 
This White Industries Hub is an excellent choice to replace a wheel that is from an older tandem which is 140mm spacing. New for this year and will allow you to run more than 6 or 7 speeds. 8, 9 and 10 speeds are available. Exclusive to Tandems East.
 
    
How to measure a rear dropout
click on image to enlarge
Mel's Tech Tips shows How to measure a rear dropout 
Take the rear wheel out of tandem and measure inside to inside of dropout. It's important to know which one of four sizes (135mm, 140mm, 145mm or 160mm) you need if you want to order a wheelset.

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