Welcome to the forums,
@Mylaguna. At 285lbs (roughly 129kg) with a full-power eMTB, braking is genuinely important to get right, so good on you for thinking about this early.
The honest answer is: at your weight, I'd do both. Upgrade to 220mm rotors
and swap the pads to metallic compounds on the DB8 calipers as a first step, and see how you feel before spending on new calipers entirely. Here's why.
The DB8 is a 4-piston caliper, so it's not fundamentally lacking in clamping area. The issue at your weight is heat management, and that's where rotor size makes the biggest difference. Going from 200mm to 220mm gives you a meaningfully larger heat sink and more leverage at the caliper. For the front on your Fox 36, you'll need a PM+20mm adapter since the 2026 Fox 36 uses an oddball 200mm post mount (not 180mm as on older models).
@Rod B. laid out the
adapter maths for Fox forks nicely: post mount height plus adapter size equals rotor size, so 200 + 20 = 220mm. For the rear, you'll need whatever adapter suits your frame's post mount spec.
For rotors, the SRAM HS2 in 220mm is a solid choice. They're 2mm thick versus the 1.8mm you see on Shimano rotors, so they last noticeably longer under eMTB abuse.
@Winford reckons the
HS2s are a worthwhile upgrade specifically because of that extra thickness. Metallic (sintered) pads will give you more consistent power when things get hot, which they will at your weight on any sustained descent.
If after running 220mm rotors with sintered pads you're still finding the DB8 levers feel vague or you're pulling them to the bar,
then it's worth looking at a caliper and lever upgrade. One option that's been well received in the community is keeping the DB8 calipers but swapping to Shimano M6100 levers, which reportedly transforms the feel and power for around £50.
@Darren66 did exactly this on a Crafty R that came with DB8s and called it the
strongest brakes he'd ever had, using Magura Blood mineral oil for the bleed. That's a fraction of the cost of full SRAM Maven or Shimano Saint calipers.
So the sequence I'd suggest: 220mm SRAM HS2 rotors front and rear, sintered pads, correct adapters. Ride it. If it's still not enough, swap the levers to Shimano M6100. If
that's still not enough, then you're into full caliper territory, but I suspect you won't need to go that far.
Edit: Corrected the Fox 36 post mount spec - the 2026 Fox 36 uses a 200mm post mount, not 180mm, so you need a PM+20mm adapter rather than PM+40mm to run a 220mm rotor. Cheers Winford for the correction!
