13/09/2026
Hi All,
It's bad news Folks...
I have spoken to the Mini Masters Organisers and our motor has been tested and has failed their tests due to its resistance being under the measure of 102ohms they have set in their rules.
Roar/BRCA used this measurement a while ago and is no longer used as it was demmed a pointless but this has no bearing on the rules Mini Masters are going with.
Our 25.5 was made to comply with the CURRENT roar 25.5 guidelines and I have confirmed with Paul Worsley that if we have a UK 25.5 BRCA Approved list that our motor would meet its requirements. Paul had already checked one for us last April for us for reference.
I am waiting for an Offical reply in writing with a summary of their tests / rules but at the end of the day it's their series and rules so nothing we can do. I have tried to pleed the case on our customers behalf with no Joy.
We will push for a BRCA 25.5 Homologation List going forward as other classes are adopting 25.5 Motors. As per all motors with natural progression it will mean they get faster over time anyway and it looks like our is the Fastest !.
From our Stance we knew nothing about the rules and still don't have all the details/specs and the first we heard of this approval was yesterday !
As you know we build ALL our motors to meet BRCA and ROAR Specs that can be as fast as possible within the regulations but this only applys to series that respect BRCA homologation rules..
For More information on why Roar dropped this rule please see this below :-
ROAR deleted global minimum motor resistance requirements (such as the blanket ~101/102 milliohm rule for 25.5T spec motors) to transition to a more precise, model-specific testing framework. [1] (https://www.roarracing.com/blog_post.php?pid=2507)
The primary reasons for this policy shift include:
Eliminating Blanket Limits: A single global minimum across all manufacturers didn't account for unique engineering differences in stator design, leg shape, and wire length variations. Some motors naturally hovered right at the legal limit straight off the shelf, creating technical inspection and manufacturing vulnerabilities. [1] (https://www.facebook.com/ROARRacing/posts/motor-list-updateas-many-of-you-have-seen-the-motor-resistance-numbers-have-been/1006928494812222/), [2] (https://www.liverc.com/news/roar-announces-r1-wurks-v21-will-remain-on-roar-approved-list/)
Tailored Model Approvals: Under the rules, a motor's minimum legal resistance is determined individually. When a manufacturer submits a specific motor model for ROAR Approval, inspectors measure its baseline. The official minimum rule for that exact model is then published at 99% of its lowest measured baseline, which factors in a built-in 1% manufacturing tolerance. [1] (https://www.roarracing.com/downloads/ROAR_Rule_Book.pdf), [2] (https://roarracing.com/blog/media/23011333-252Summary.pdf), [3] (https://www.roarracing.com/blog_post.php?pid=2507)
Fairer Tech Inspections: Shifting the baseline to a per-model rule prevents manufacturers from exploiting loopholes in generalized blanket dimensions. It also provides local track tech stations with a highly accurate, model-specific threshold to check against using standardized temperature environments (25°C). [1] (https://www.liverc.com/news/roar-announces-r1-wurks-v21-will-remain-on-roar-approved-list/), [2] (https://www.roarracing.com/downloads/ROAR_Rule_Book.pdf)
