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38.1mm stem that's 50mm or less but with a 15deg rise?
Cos I can't find any.
Ah, come on, I only had a quick browse of one shop and found three candidates 🙂
https://www.tredz.co.uk/.Azonic-Baretta-Evo-Stem-31-8-40mm_217401.htm
https://www.tredz.co.uk/.Nukeproof-Horizon-Stem_216449.htm
https://www.tredz.co.uk/.DMR-Defy-Stem_102046.htm
15 degrees is about 13mm rise on a 50mm, 9mm on a 35mm. Not quite sure what they're using as reference points, as the (nominal 5mm rise) DMR looks from those photos to have more vertical offset than the (nominal 10mm rise) Nukeproof, but hey. The Azonic does tick your boxes explicitly. Assuming you don't actually mean 38.1mm of course 😉
Cheers Bez, tbh I only looked at CRC & Wiggle, I need to go to Specsavers!
& yes, 31.8 not 38.1!