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My wife is after a a commuter that can take panniers. 3 mile ride - half of it up a hill.
I found a Genesis Brixton on sale (online) and it looks way too cool. Its a size Med but has a reach of 385mm - which is 25mm shorter than the reach on her size Small mtb.
So I'm guessing the med would be ok? (hand holding purchase...)
https://www.genesisbikes.co.uk/genesis-brixton-vargn21270
Another eye catcher is the Calibre Stitch - though it s only showing a Large.
Pretty much anything of the correct size would do. My grocery shop is three miles each way and return half of it all uphill. I (variously) use - retro tourer, 3spd Dutch bike (cog/ring change set to ‘climb’), 29er (with rack)
If I had to vote for the one which gives me the most pleasure then definitely the Dutch bike but that’s for shopping/cargo not for speed.
Otherwise the (531ST) tourer*, as it’s swift and very comfy. Carries panniers with a shrug. Full-length mudguards and racks are featured as part of the build. Needs a kickstand really for when loading.
Yes it’s ‘over-biked’ for a six-mile journey but six miles of smiles are infinitely preferable to some deadweight old alu hybrid that I once had for commuting (shudder).
*Bonus = with the tourer I can also feasibly go touring/do longer commutes at other times. Minus rack it’s also not too shabby for audaxy keep/fit work (since fitted drops)

Forgot to say, the reach of the Brixton vs her MTB could also be further shortened via the swept bars on the Brixton (depending on the bars of her MTB)
Looks like a perfect bike for short commute though, and a medium (sufficient standover granted) may put the grips right where required? might be worth doing further calculations.
I’ve commuted/carried on (steel) Genesis bikes (Vagabond and now Longitude) in all weathers and they seem hardy/fairly decent comfort-wise, if a tad lardy for what they are marketed as.
I’d still go bonafide Dutch utility bike (Gazelle, Batavus...) for urban/city short trips, which although appreciably heavier have little-to-no maintenance throughout the year. All of the parts on my Batavus Personal are just quality through and through. The hub gear much better for town and stop-start. step-thru frame the same/better for mount/dismount when loaded. It’s longer too so stable and stately. Swept bars are high and visibility is improved because of. Important things like hub dynamo, lights kickstand, pannier rack, chainguard, wheel-lock etc were all included. So worth spending the extra because it saves in the end. (Although I got mine for £120 in classifieds!) Roller brakes are silent in the wet and dry. I really need to fix mine up again (left it in a damp shed for too many years)
If she goes the Genesis route, do check the Genesis brand seatpost as water got down mine from a hole below the seatclamp. Now fixed with a bit of tape. Obviously if using mudguards it may not be an issue.
Thanks p7 for the great reply.
I think we will go for it. Yea - stand over height isn't great but she has knows what she is doing shy says. I mentioned that leaning the bike over to get on with 5kg in her panniers won't be ideal.
I could probably put a shorter stem on it too - although I don't know what that will be like with those swept back bars?
Yep, I can’t rave enough about a stepthru city bike and massive kickstand. It just makes me relax and enjoy loading, mounting, dismounting, whatever. Not so bad to have a toptube/no kickstand if you only have one stop but on multistop errands with big loads then stepthru is I would say essential now I’ve compared.
Don’t think they make my Batavus anymore but this looks pretty much identical:
https://www.dutchbikeshop.co.uk/batavus-entree
Anyway, good luck with the Brixton!
Looks way too functional - I don't think i could ever get her to approve of that 🙂
I recommended the Brixton a couple of years back to my pal for commuting, he chose a Boardman Hybrid instead due to getting a very good deal, he loves the Boardman and has done thousands of km's on it since.
I kept dropping a hire bike when stopped at junctions when in Copenhagen due to no top tube to rest against my leg.