UN Regulation No. 41: Motorcycle Noise

Uniform Provisions Concerning the Approval of Motor Cycles with regard to Noise

Related groups: ASEP II, GRB, GRBP, and R41WG
UN R41 | Revision 2 | Amendment 1 (2014)
17 Oct 2014 2014-10-21 15:49:44 UTC 2 1 04 series of amendments | Supplement 1 Based upon the adopted proposal: WP.29/2014/2

Proposal approved by the GRB to update UN R41 with the latest amendment of ISO 5130:2012, to correct the typing error of the decibel unit dB(A) (corrected from db(A)) and delete the unnecessary unit, and to revise the current list in Annex 4 as an itemized list for greater clarity.

UN R41 | Revision 2 | Amendment 2 (2015)
9 Nov 2015 2015-11-26 14:58:58 UTC 2 2 04 series of amendments | Supplement 2 Based upon the adopted proposal: WP.29/2015/2

Proposal as approved by GRB to clarify certain terms and symbols used in Annex 7 (ASEP) of the regulation.

UN R41 | Revision 2 | Amendment 3 (2016)
5 Feb 2016 2016-02-10 10:35:06 UTC 2 3 04 series of amendments | Supplement 3 Based upon the adopted proposal: WP.29/2015/61

Proposal to introduce a calculated engine speed (in addition to measured engine speed) for MT vehicles and for continuously variable transmission (CVT)/automatic transmission (AT) with locked gear mechanism into UN Regulation No. 41 for the tests in Annex 3 and Annex 7 (Additional sound emission provisions – ASEP)

UN R41 | Revision 2 | Amendment 4 (2016)
28 Oct 2016 2016-11-02 14:50:02 UTC 2 4 04 series of amendments | Supplement 4 Based upon the adopted proposal: WP.29/2016/3

In response to concerns that approval agencies may not grant manufacturers the additional 1dB for L(wot) on conformity of production tests as changes had been made to Annex 6 of R41-04, GRB issued an interpretation recorded in the report of its 56th session. The proposal formalizes the interpretation as an explicit provision of the regulation.

UN R41 | Revision 2 | Amendment 5 (2017)
22 Feb 2017 2017-05-31 17:13:15 UTC 2 5 04 series of amendments | Supplement 5 Based upon the adopted proposal: WP.29/2016/46

Proposal to clarify the test procedure by explicitly excluding first gear where possible from the ASEP control range and to clarify that conditioning of a silencing system is necessary only in cases where exhaust gases come into contact with silencer fibrous materials.

UN R41 | Revision 2 | Amendment 6 (2018)
2 Nov 2018 2019-03-21 14:40:45 UTC 2 6 04 series of amendments | Supplement 6 Based upon the adopted proposal: WP.29/2018/6

Proposal to delete a description of the L4 vehicle category (motorcycles with a side car) from Annex 3 to Regulation No. 41. These vehicles fall under the scope of UN R9, having been removed from the scope of UN R41 as of the 04 series of amendments.

UN R41 | Revision 2 | Amendment 7 (2019)
8 Nov 2019 2019-12-30 12:20:12 UTC 2 7 04 series of amendments | Supplement 7 Based upon the adopted proposal: WP.29/2019/3

Proposal to require additional sound emission provisions (ASEP) testing under UN R41.

UN R41: Revision 2 (2012)
14 Aug 2012 2012-08-17 06:59:37 UTC 03 series of amendments 03 series of amendments | Supplement 1 Corrigendum 1 to Revision 1 04 series of amendments Based upon the adopted proposal: WP.29/2011/62

Adopted proposal integrated into UN R41: Revision 2 on 14 August 2012.

Earlier texts may be available through the UN Official Document System.