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GENERAL SUSPENSION
FORK MANUAL
Carefully read, understand and follow the instructions provided in this
manual, and keep it in a safe place for future reference. If you have any
doubt whatsoever regarding the use or maintenance of any SR
SUNTOUR product, please contact SR SUNTOUR. Failure to follow these
warnings and instructions can result in product malfunction, causing an
accident, severe injury or death.
Overview...........................................................................................................................2
Important safety information.......................................................................................2
Before every ride.............................................................................................................3
Fork assembly..................................................................................................................3
Tire clearance test..........................................................................................................4
Tire clearance............................................................................................................4
Suggested tire size.......................................................................................................4-6
Maximum brake rotor size.........................................................................................7-8
Q-LOC assembly..............................................................................................................9
20mm bolted thru axle assembly...............................................................................10
20mm cross thru axle assembly..................................................................................10
15AH4/15AH3/12AH bolted thru axle assembly......................................................11
5TA QR & tool type thru axle assembly....................................................................12
Air pressure adjust .....................................................................................................13
Setting SAG.....................................................................................................................14
Air volume adjust..................................................................................................15-16
Coil spring preload......................................................................................................17
Maintenance of the fork.............................................................................................17
Intended use................................................................................................................18
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Related Manuals for SR Suntour DUROLUX38X-Boost
Summary of Contents for SR Suntour DUROLUX38X-Boost
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Page 1: Table Of Contents
If you have any doubt whatsoever regarding the use or maintenance of any SR SUNTOUR product, please contact SR SUNTOUR. Failure to follow these warnings and instructions can result in product malfunction, causing an accident, severe injury or death. -
Page 2: Overview
Do not bend the dropouts ! ⮚ If you are using a bicycle rack that fastens the bicycle at warranty. ⮚ SR SUNTOUR suspension fork is designed for use by a the front dropouts only, then the rear wheel must be single rider. -
Page 3: Before Every Ride
2. Measure the length of the steerer tube of your old fork and compare it to the length of the steerer tube of the SR SUNTOUR fork. The standard length of SR SUNTOUR suspension fork steerer tube is 255mm. It may be necessary to shorten the steerer tube to the correct length. -
Page 4: Tire Clearance Test
SUGGESTED TIRE SIZE Suggested Max allowed Max allowed MODEL ETRTO Tire Size Tire Width Tire O.D. DUROLUX38X-Boost 29" 29"x2.6" 65-622 67mm 762mm AION38X-Boost 29" 29"x2.6" 65-622 67mm 756mm AION38X-Boost 27.5"... - Page 5 SUGGESTED TIRE SIZE Suggested Max allowed Max allowed MODEL ETRTO Tire Size Tire Width Tire O.D. MOBIE36-Boost 29" 29"x2.6" 65-622 67mm 756mm MOBIE36-Boost 27.5" 27.5"x2.6" 65-584 67mm 723mm MOBIE35-CGO Boost 27.5" 27.5"x2.6" 65-584 67mm 723mm MOBIE34-(D)-Boost 29" 29"x2.4" 62-622 63mm 754mm MOBIE34-(D)-Boost 27.5"...
- Page 6 Suggested Max allowed Max allowed MODEL ETRTO Tire Size Tire Width Tire O.D. XCR32-Boost 29” 29”x2.4” 62-622 63mm 756mm XCR32-Boost 27.5” 27.5”x2.5” 64-584 66mm 724mm XCR34-Boost 29” 29”x2.4” 62-622 63mm 760mm XCR34-Boost 27.5” 27.5”x2.6” 65-584 67mm 725mm XCR34-JR-Boost 24” 24”x2.6” 65-507 68mm 640mm...
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Page 7: Maximum Brake Rotor Size
MAXIMUM BRAKE ROTOR SIZE Rotor size when disc caliper Fork model Max. rotor size mounted directly DUROLUX38X-Boost 29” 203mm 220mm AION38X-Boost 29”/27.5” 203mm 220mm DUROLUX36X-Boost 29”/27.5” 203mm 220mm AION36X-Boost 29”/27.5” 180mm 220mm ZERON36X-Boost 29”/27.5” 180mm 220mm MOBIE35-CGO-Boost 27.5" 180mm 220mm XCR36X-Boost 29”/27.5”... - Page 8 MAXIMUM BRAKE ROTOR SIZE Rotor size when disc caliper Fork model Max. rotor size mounted directly NEX DS 700C/26" 160mm 180mm NEX-E25 DS 700C/26" 160mm 180mm XCT-Plus DS 24" 160mm 160mm XCT-JR-L DS 24"/20" 160mm 160mm XCT-JR DS 24" 160mm 160mm XCT DS 20"...
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Page 9: Q-Loc Assembly
Q-LOC ASSEMBLY 1. Check the segmented flange to be expanded before installation and open the lever completely. 2. Slide in the axle until it "clicks". Make sure the segmented flange is expanded. 3. Set the tension of the nut until the flange is flush with the dropout. -
Page 10: 20Mm Bolted Thru Axle Assembly
20MM BOLTED THRU AXLE ASSEMBLY 1. Slide in the axle and tighten it with a 6mm Allen wrench by suggested tightening torque of 10Nm. 2. Tighten the safety clamp with a 4mm Allen wrench by suggested tightening torque of 7Nm. 20MM CROSS THRU AXLE ASSEMBLY 1. -
Page 11: 15Ah4/15Ah3/12Ah Bolted Thru Axle Assembly
15AH4/15AH3/ 12AH BOLTED THRU AXLE ASSEMBLY Note: Before installation, make sure to check the o-ring is correctly seated at the thread part. 1. Fully insert the axle on the drive-side. 2. Tighten the axle with a 6mm Allen wrench by the suggested tightening torque of 8-10Nm. -
Page 12: 5Ta Qr & Tool Type Thru Axle Assembly
5TA QR & TOOL TYPE THRU AXLE ASSEMBLY 1. QR & tool type skewer are provided by hub or wheel supplier. 2. Please follow the instruction manual from your hub supplier for correct instruction of assembly and proper torque setting of the wheel axle. 3. -
Page 13: Air Pressure Adjust
AIR PRESSURE ADJUST WARNING ! Always refer to SAG setting (PG-14) for initial setup as baseline. Fine-tuning may be required based on riding conditions and personal preferences For more details, consult a qualified and trained bicycle mechanic at your bike shop to get proper advice. As you ride and getting used to your fork, adjust the settings as needed. -
Page 14: Setting Sag
OPEN position. ⮚ Below chart is the suggested SAG range and the original air pressure chart, set for the SR SUNTOUR air suspension forks from the factory. Remember that these are the starting points. Adjustments will vary based on rider ability, trail conditions, frame design, and personal preference. -
Page 15: Air Volume Adjust
AIR VOLUME ADJUST Additional tuning options: Air Volume Adjust Spacers Changing air volume spacers in some fork models is an easy internal adjustment that allows you to change the amount of mid stroke and bottom out resistance. Even if you have set your sag, but using full travel (bottoming out) too easily, then you could install one or more spacers to increase the bottom out resistance. - Page 16 Turn the preload adjust knob clockwise to increase the spring preload and turn it counter-clockwise to reduce it. Two additional spring hardnesses are available for SR SUNTOUR suspension forks - softer and harder than the standard coil spring.
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Page 17: Coil Spring Preload
MAINTENANCE OF THE FORK As long as moving parts are exposed to moisture and contamination, the performance of your suspension system might be reduced after several rides. In order to maintain high performance, safety and a long life of your suspension system, periodic maintenance is required. ⮚... -
Page 18: Intended Use
Downhill, Enduro, All- BE USED FOR All-mountain, XC Downhill, Enduro Downhill Downhill, Enduro, All mountain, XC racing, XC Enduro, All- Downhill mountain, racing, XC mountain XC racing DUROLUX38X-Boost ● ● DUROLUX36X-Boost ● ● AION38X-Boost ● ● AION36X-Boost ● ● ZERON36X-Boost ●... -
Page 19: Web Links
For further information please visit www.srsuntour-cycling.com. There you will also find: ◆ Service request: http://www.srsuntour-cycling.com/service/service-request ◆ Tech videos: http://www.srsuntour-cycling.com/service/tech-videos ◆ Download area: https://www.srsuntour.com/en/service/download-area ◆ Owners manuals: https://www.srsuntour.com/en/service/download-area/consumer-downloads/suspension- fork/suspension-fork-manual/ ◆ Fork glossary: https://www.srsuntour.com/en/service/product-support/glossary/fork-glossary ◆ Warranty: http://www.srsuntour-cycling.com/service/warranty KAE261-3 Copyright © 2025 SR SUNTOUR Inc. All rights reserved.
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