Hi eagamer80,
Are you sure you have the "Marathon" Winter version with 240 spikes ? I thought the 30-622 was only available in basic Winter with 120 spikes.
https://www.schwalbe.com/en/spikes.html
In any case, you'd probably feel safer with the 42-622 Marathon Winter riding it at lowest pressure like 30 psi.
The 50-622 might be too large for your fenders and you'll need some extra space anyway as snow & gravels will stick a bit on tires.
Another option is to go for more MTB type if your commute takes you through soft snow parts often.
The Continental Nordic Spike 42-622 are more aggressive than the Marathon Winter and since you're capped at 25km/h, the extra rolling resistance won't matter much.
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I have them in 54-559 on my MTB, big difference in melted/soft snow because of the size of the lugs.
For comparison, here are those three winter tires.
Schwalbe Winter 120 spikes below, nice for straight handling as spikes only in center/flat area.
Schwalbe Marathon Winter 240 spikes below, better for angled/turn handling as extra spikes on the curved/round area.
Continental MTB Nordic Spike 240 spikes below, same as Marathon Winter but deep/large lugs to bite the mud and deeper snow.
BTW, here's a picture from last week after the snow storm in Stockholm with my new BH Easy Motion Nitro City speedelec 45 km/h, Marathon Winter 42-622.
I highly recommend the Tourer STX motorcycle jacket from Hein Gericke, second one I own, exceptional quality and very technical.
I just bought it for 115€ + 20€ shipping from their outlet, that jacket should sell for 400-500€.
One unique feature is their "Storm Collar", it's like a permanent neck warmer, no need to wear a scarf.
See the picture below and understand that it comes ON TOP of the regular collar which uses basic velcro.
So you can have three setups according to heat/sweat: (1) keep regular collar loose (2) close regular collar (3) close Storm Collar.
Plus it has integrated elbows/shoulders protectors so good stuff in case of fall.
I'm 186cm 90kg and bought the size UK 46 - EU 56. The size EU 54 was too short on the sleeves and buttocks.
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The rest is:
- Indestructible heavy duty carpenter trousers X-1500 420g/m² canvas from Blåkläder brand (translates as "Blue-Collar" in English, call-it-like-it-is Swedish at its best :-D), 100€/105$.
Also have them in Softshell wind- and waterproof version, the pants are insane in winter, 125€/130$
In all of them you can add protection pads on the knees.
https://www.blaklader.uk/en/search-results?q=x1500
- Kamik Alborg boots (like Sorel but better quality/price according to reviews) from Amazon.fr/uk 75€/80$
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- Decathlon (french sport retail chain, stores in 38 countries) snowboard H300 helmet with critical warm ear-cushions, 30€/33$.
http://www.decathlon.co.uk/h300-adult-ski-helmet-black-id_8374252.html
- Decathlon Arenberg cycling glasses, super cheap at 5€/6$ a pair, great protection against insects/rain/snow/wind.
Available in colorless, yellow (great for fog/snow) and brown/grey for sunny days.
Buy half-a-dozen mixed and place one pair everywhere (backpacks, jackets, car, bike carrier, drawer) and forget about worrying to lose them like precious Oakley's & co.
http://www.decathlon.co.uk/arenberg-cycling-sunglasses-category-1-yellow-id_8118519.html
T.
PS: updated post with pictures and links due to cross-sharing with other threads on winter clothing.