Subscribe
Information on new and updated products, upcoming events, and more!
Dropouts
Selecting a Dropout
General Information
We manufacture a wide variety of rear dropouts in titanium, steel, and stainless steel.
Consider the following when choosing your dropout:
- The style of bicycle being built
- How the bicycle will be ridden
- The weight and size of the rider
- The type of hub, derailleur, and brake mount that will be used
Hanger Alignment
- Hanger alignment for rear dropouts: click here
Important!
-
Compatibility between components is only guaranteed when using parts made by Paragon Machine Works
-
We cannot advise or make recommendations for parts made by other manufacturers
Bending Dropout Tabs
Important!
Please do not bend the tabs on our dropouts to align them with the stays! Instead:
- Slot the stays at an angle or use a transition piece like our seatstay/chainstay plugs
Bent Dropout Tabs
- Are more work for the builder
- Can weaken the dropout
- Introduce stresses that make further alignment difficult
- May interfere with how the dropout functions.This is particularly applicable to all our adjustable dropouts
- ARE NOT GUARANTEED
Round, Rear Dropouts
Simple, clean, elegant. This style of dropout allows the chainstay and seatstay to be oriented at any angle, and welded directly to the frame component.
Materials
17/4 Stainless Steel Options:
- 1-1/8" OD x 22 mm
- 1-1/8" OD x 22 mm, integral hanger
- 1-1/8" OD, Speed Release System
1018 Steel Option:
- 1-1/2" OD, 10 and 12 mm options
6/4 Titanium Options:
- 1-1/8" OD
- 1-1/2" OD, 10 and 12 mm options
Compatibility
- 10 mm Hub
- 12 mm Hub
Purchase Separately
- Replaceable Inserts, available in different styles and colors:
- No hanger
- Hanger
- Shimano
- SRAM
- Skewers:
- Available in a variety of lengths for 12 mm hangers/inserts
- 23% off when purchased with a compatible hanger, insert or dropout
Snap Ring Dropouts
This small, light dropout utilizes a snap ring instead of bolts to secure the hanger for a smaller/lighter profile.
Materials
17/4 Stainless Steel
- 1" OD
- 1-1/8" OD
1018 Steel
- 1" OD x .866"
- 1-1/8" OD x .866"
- 1-1/8" OD x 1"
6/4 Titanium
- 1-1/8" OD
- 1-1/4" OD
Compatibility
12 mm Hub
Purchase Separately:
- Hangers, available in different styles and colors:
- No hanger
- Hanger
- Shimano DM Mountain
- Shimano DM Road
- SRAM Eagle
- Skewers:
- Available in a variety of lengths
- 23% off when purchased with a compatible hanger
Syntace Dropouts
These dropouts are compatible with Syntace X-12 system. Theyaccommodates a concentric or eccentric threaded insert in the right frame component to center the wheel in the frame and correct inconsistencies. Because imperfections are real!
Materials
17/4 Stainless Steel
- 1" OD x 25 mm
1018 Steel
- 1" OD x 20.5 mm
- 1" OD x 25 mm
- 1-1/4" OD x 25 mm
6/4 Titanium
- 1-1/4" OD x 1"
- 1-1/2" OD x 28 mm
Compatibility
- 12 mm Hub
- Syntace X-12 System
Purchase Separately
- Compatible Syntace X-12 products
- Skewers:
- Available in a variety of lengths
- 23% off when purchased with a compatible insert
Helpful Information
Uses a concentric or eccentric threaded insert in the right frame component to center the wheel in the frame and correct inconsistencies
Flat/Post Mount Disc Brake Dropouts with Bolt-on Brake Insert (BoBI)
The bolt-on brake insert (BoBI) allows for different brake configurations with built-in alignment.
Materials
- 17/4 Stainless Steel
- 6/4 Titanium
Compatibility
12 mm hub
Brake Mount:
- Flat mount for 140 mm rotor
- Post mount for 160 mm rotor
Purchase separately:
- Bolt-on Brake Inserts:
- Available in bare and black anodized 6061 aluminum
- Replacement Hangers, available in different styles and colors:
- No hanger
- Hanger
- Shimano DM Mountain
- Shimano DM Road
- SRAM Eagle
- Skewers:
- Available in a variety of lengths
- 23% off when purchased with a compatible hanger
Information
- The seat stay tabs are swept back, allowing stay and caliper clearance for all frame sizes
- Bolts:
- Thread into the bottom of the caliper
- Pass through the insert from the bottom
- Perform a mock-up with the caliper you intend to use before building
BoBI Dropouts for the SRAM UDH/T-Type Systems
Our BoBI dropouts accommodate various brake mount options AND the SRAM UDH/T-Type systems
Materials
- 17/4 Stainless Steel
- 6/4 Titanium
Compatibility
- 12 mm Hub
- SRAM Universal Derailleur Hanger
- SRAM T-Type
Purchase separately
- Brake Mount:
-
Flat mount for 140 mm rotor
-
Post mount for 160 mm rotor
-
- Bolt-on Brake Inserts:
- Available in bare and black anodized 6061 aluminum
- Skewers:
- Available in a variety of lengths
- 23% off when purchased with a compatible hanger
Information
- The seat stay tabs are swept back, allowing stay and caliper clearance for all frame sizes
- Bolts:
- Thread into the bottom of the caliper
- Pass through the insert from the bottom
- Perform a mock-up with the caliper you intend to use before building
Round, Rear Dropouts for the SRAM UDH/T-Type Systems
This style offers all the advantages of our round, rear dropouts while accommodating the SRAM UDH/T-Type.
Materials
1018 Steel
- Eccentric style only
- Flange Diameter = 1-3/4"
- Flange Width = 25 mm
6/4 Titanium
- Fixed and Eccentric styles
- Flange Diameter = 1-3/4"
- Flange Width = 1.180"
Compatibility
SRAM (meets all SRAM specs):
- Universal Derailleur Hanger
- T-Type
12 mm Hub:
- SRAM Universal Derailleur Hanger has M12 x 1 hole
Brake Mount:
- Flat mount for 160 mm rotor
- Post mount
- Integrated flat mount for 160/180 mm rotor
Compatible Products
Purchase Separately
- Bushing for fixturing and eccentric model:
- Use 0 mm for fixturing
- Use 0.5, 1 mm for alignment
- SRAM Universal Derailleur Hanger
- Skewers:
- Available in a variety of lengths
- 23% off when purchased with a compatible insert
Alignment
- Frame components are symmetric side-to-side
- Eccentric styles require a bushing:
- Titanium must be welded in
- Stainless steel and steel must be silver soldered/brazed in
- Bushing is a structural part of the assembly
- The chainstay center MUST be 3.5 mm above alxe center to meet SRAM specs
- Use the flats on the bottom of the dropout to index
Flat Mount Disc Brake Dropouts
This dropout allows for flat mount disc brake applications; the locating features on the caliper mounts are integral so no fixture is needed.
Materials
- 17/4 Stainless Steel
- 4130 Steel
- 6/4 Titanium
All Materials
- Available in 58 or 70 degree angles
- Available with 4 each M5 x .8 eyelets, or without eyelets
Compatibility
- 12 mm Hub
Flat Mount Brake Calipers (included with purchase):
- Stainless steel and steel: 2 each single caliper mounts
- Titanium: 1 each double caliper mount
Purchase Separately
- Replaceable Inserts, available in different styles and colors:
- No hanger
- Hanger
- Shimano DM Mountain
- Shimano DM Road
- SRAM
- Flat Dropout plugs:
- Chainstay
- Seatstay
- Skewers:
- Available in a variety of lengths
- 23% off when purchased with a compatible insert
Information
- Compatible caliper mounts must be welded to the dropout
- Locating features on caliper mounts are integral, no fixture is needed for location
- For information on hanger alignment, click here
Low Mount Disc Brake Dropouts
This style of dropout is good for most modern, small, low-profile calipers.
