# What is the saddle setback rule for TT bikes

**URL:** <https://community.escapecollective.com/t/what-is-the-saddle-setback-rule-for-tt-bikes/5898>\
**Category:** Tech\
**Created:** [September 13, 2026, 7:32am UTC](https://community.escapecollective.com/t/what-is-the-saddle-setback-rule-for-tt-bikes/5898 "2026-09-13T07:32:33Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Hugh\_Mckellar](https://community.escapecollective.com/user_avatar/community.escapecollective.com/hugh_mckellar/32/5270_2.png) [@Hugh\_Mckellar](https://community.escapecollective.com/u/Hugh_Mckellar)\
**Post date:** [September 13, 2026, 7:32am UTC](https://community.escapecollective.com/t/what-is-the-saddle-setback-rule-for-tt-bikes/5898/1 "2026-09-13T07:32:33Z")

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i’m just trying to work out what the saddle setback rule for time trial bikes is I’m finding conflicting documents saying it is zero mm or 50 mm behind the bottom bracket. Can anybody please set me straight and provide a link to any official document? My saddle is currently 38 mm behind the bottom bracket and I don’t really want to change it.

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**Author:** ![Kevin\_Klaes](https://community.escapecollective.com/user_avatar/community.escapecollective.com/kevin_klaes/32/1414_2.png) [@Kevin\_Klaes](https://community.escapecollective.com/u/Kevin_Klaes)\
**Post date:** [September 13, 2026, 11:02pm UTC](https://community.escapecollective.com/t/what-is-the-saddle-setback-rule-for-tt-bikes/5898/2 "2026-09-13T23:02:11Z")

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I believe Ronan said it changed this year to no restriction on a podcast.

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**Author:** ![Luke\_Falk](https://community.escapecollective.com/user_avatar/community.escapecollective.com/luke_falk/32/1061_2.png) [@Luke\_Falk](https://community.escapecollective.com/u/Luke_Falk)\
**Post date:** [September 14, 2026, 1:45am UTC](https://community.escapecollective.com/t/what-is-the-saddle-setback-rule-for-tt-bikes/5898/3 "2026-09-14T01:45:35Z")

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IIRC, Ronan said it was clear for road bikes that the setback was now 0mm, but it isnt as clear for TT bikes.

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**Author:** ![Jonny\_Allen](https://community.escapecollective.com/user_avatar/community.escapecollective.com/jonny_allen/32/420_2.png) [@Jonny\_Allen](https://community.escapecollective.com/u/Jonny_Allen)\
**Post date:** [September 14, 2026, 12:24pm UTC](https://community.escapecollective.com/t/what-is-the-saddle-setback-rule-for-tt-bikes/5898/4 "2026-09-14T12:24:46Z")

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> **[UCI Time Trial regulations for 2026 onwards explained by AeroCoach](https://www.aero-coach.co.uk/uci-time-trial-position-regulations-for-2026-onwards)**
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> Dr Xavier Disley explains UCI time trial bike position rules and regulations from 2026 onwards. The video shows how a bike is placed into a UCI jig and measured.

In essence you can leave it at 38mm setback, it’ll just impact the extension reach you can achieve.

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**Author:** ![Hugh\_Mckellar](https://community.escapecollective.com/user_avatar/community.escapecollective.com/hugh_mckellar/32/5270_2.png) [@Hugh\_Mckellar](https://community.escapecollective.com/u/Hugh_Mckellar)\
**Post date:** [September 15, 2026, 3:42am UTC](https://community.escapecollective.com/t/what-is-the-saddle-setback-rule-for-tt-bikes/5898/5 "2026-09-15T03:42:32Z")

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I just found this. Seems like it’s 50mm for tt and 0 for road, which is peak uci nonsense.

 ![image](https://community.escapecollective.com/uploads/default/original/2X/0/07d369a8ec53c78dd880b5cb45beb9ebabc23cb4.webp)