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The material also supplies rotor size recommendations by rider+bike system weight, plus compatibility notes by riding type and rotor system (HS2, Paceline, Centerline). It further outlines how to identify fork and frame mount types and related caliper 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thread engagement length is required for thru bolt or flat mounts?","Question",{"text":62,"@type":63},"For forks and frames with thru bolt or flat mounts (with or without brackets), there must be 5–7 mm of mounting bolt thread engagement when mounting brake calipers.","Answer",{"name":65,"@type":60,"acceptedAnswer":66},"What thread engagement length is required for post mounts?",{"text":67,"@type":63},"For forks and frames with post mounts (with or without brackets and/or spacers), there must be 9–13 mm of mounting bolt thread engagement when mounting brake calipers.",{"name":69,"@type":60,"acceptedAnswer":70},"How can you identify the fork mount type?",{"text":71,"@type":63},"Consult the fork manufacturer’s instructions or measure the distance between the center of each bolt hole to determine whether the mount is flat (70 mm), post (74 mm), thru bolt (34 mm), or IS (51 mm).","https://schema.org",{"og:url":32,"og:type":74,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":76,"canonical":32},"index,follow",{"doc_id":78,"site_id":7},673139,1793621359,{"code":4,"msg":81,"data":82},"success",[83,87,91,95,100,104,109,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":84,"show_sort_weight":85,"slug":86},"Story & 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Specification ............................................................................................. 3  \nRotor Size Recommendation Chart ............................................................................. 4  \nSRAM Caliper Type Identification ............................................................................... 5  \nFork Mount Identification ............................................................................................. 6  \nFrame Mount Identification .......................................................................................... 7  \nFlat Mount and Thru Bolt Standard ............................................................................. 8  \nFlat Mount and Thru Bolt Standard ............................................................................. 9  \nPost Mount Standard .................................................................................................. 10  \nPost Mount Standard ................................................................................................... 11  \nPost Mount Standard .................................................................................................. 12  \nPost Mount Standard with CPS Washers ................................................................. 13  \nPost Mount Standard .................................................................................................. 14  \nInternational Standard Mount (IS) ............................................................................ 15  \nIS Standard ................................................................................................................... 16  \nFor SRAM Trademark information, [visit:](visit: www.sram.com/website-terms-of-use)[ ](visit: www.sram.com/website-terms-of-use)[www.sram.com/website-terms-of-use](visit: www.sram.com/website-terms-of-use).  \n2  \nBolt Length Specification  \nBolts and brackets may need to be purchased separately.  \n⚠WARNING  \nChoose the correct bolt length for proper thread engagement. Riding a bike with improper bolt engagement can allow the brakes to disengage from the bicycle, which can lead to a crash and serious injury or death to the rider.  \nFor forks and frames with thru bolt or flat mounts, with or without brackets, there must be 5-7 mm of mounting bolt thread engagement when mounting brake calipers.  \nFor forks and frames with post mounts, with or without brackets and/ or spacers, there must be 9-13 mm of mounting bolt thread engagement when mounting brake calipers.  \nFlat Mount Frame and Thru Bolt Fork  \n5-7 mm  \nPost Mount Fork  \n 9-13 mm   \n3  \nRotor Size Recommendation Chart  \n\n| System Weight (Rider + Bike) | Recommended Rotor Size (Rear/Front) (mm) 1\u003Cbr>|  |  |  |  |\n| --- | --- | --- | --- | --- | --- |\n|  | \u003Cbr>Road, Gravel, Cyclocross 2\u003Cbr>| Cargo/E-Cargo, E-Commuter 3\u003Cbr>| Cross-country 3\u003Cbr>| Trail 3\u003Cbr>| Downhill 3\u003Cbr>|\n| \u003C 140 lbs (63 kg) | 140 | 160 | 160 | 160 | 180 |\n| 140-170 lbs (63-77 kg) | 140/160 | 160/180 | 160/180 | 160/180 |  |\n| 170-200 lbs (77-91 kg) |  |  |  | 180/200 | 180/200 |\n| 200-230 lbs (91-104 kg) | 160 | 180 | 180 |  |  |\n| 230-260 lbs (104-118 kg) |  |  |  |  | 200 |\n| 260-290 lbs (118-132 kg) | 160/180 |  |  | 200 |  |\n| 290-320 lbs (132-145 kg) |  | 200 | 200 |  |  |\n| > 320 lbs (145 kg) | 180 |  |  | 220 | 220 |\n\n\n| 1 | If riding styles conflict, it is up to the user to size up or size down based on necessary braking power. |\n| --- | --- |\n|  |  |\n|  | Road, Gravel, Cyclocross--Consult the fork or frame manufacturer’s specifications before installing a 140 mm or 180 mm rotor. These rotor sizes have compatibility limitations on many forks and frames. |\n| 2 |  |\n|  |  |\n| \u003Cbr> 3  E-bikes--Consult the appropriate riding style column and select rotor size based on system weight. |  |\n\n\n| Rotor Type | Intended Use | Compatibility |\n| --- | --- | --","cbCaieAkQq14QTdk","https://ap.wps.com/l/cbCaieAkQq14QTdk","pdf",4051463,17,"English","# Bolt Length Specification\n## Rotor Size Recommendation Chart\n## SRAM Caliper Type Identification\n## Fork Mount Identification\n## Frame Mount Identification\n## Flat Mount and Thru Bolt Standard\n## Post Mount Standard\n## International Standard Mount (IS)","[{\"question\":\"What thread engagement length is required for thru bolt or flat mounts?\",\"answer\":\"For forks and frames with thru bolt or flat mounts (with or without brackets), there must be 5–7 mm of mounting bolt thread engagement when mounting brake calipers.\"},{\"question\":\"What thread engagement length is required for post mounts?\",\"answer\":\"For forks and frames with post mounts (with or without brackets and/or spacers), there must be 9–13 mm of mounting bolt thread engagement when mounting brake calipers.\"},{\"question\":\"How can you identify the fork mount type?\",\"answer\":\"Consult the fork manufacturer’s instructions or measure the distance between the center of each bolt hole to determine whether the mount is flat (70 mm), post (74 mm), thru bolt (34 mm), or IS (51 mm).\"}]","MTB & Road Disc Brake - Caliper Mounting Specifications - Bolt Length Specification | PDF",43]