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Tyre Size Advice for CB750 K4 (Avon Roadrider MKII)

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Yuppie_88 (Luke):
Hi all,

I’m looking for some advice on tyre sizing for my CB750 K4. I’ve been doing some research (with a bit of help from ChatGPT), but I’d really like some human input from riders who’ve tried different setups.

My bike currently has:
Front: 4.10-19 (≈ 100/90-19)
Rear: 5.10-18 (≈ 130/90-18)

I’m planning to fit a set of Avon Roadrider MKII tyres, and I’m debating whether to stick close to stock or keep the slightly upsized look it already has. Here are the options I’m considering:

Option (A):
Front: 100/90-19
Rear: 120/90-18 (closer to stock)

Option (B):
Front: 100/90-19
Rear: 130/80-18 (chunkier look, slightly lower profile)

Option (C):
Something else entirely — if you’ve run different sizes that you feel work better, I’d love to hear.

royhall:
Can you still get Avon RoadRiders. They quit making them a while back when Avon deserted the UK.

Sent from my Pixel 7 Pro using Tapatalk

Skoti:

--- Quote from: Yuppie_88 (Luke) on September 04, 2025, 09:04:29 PM ---Hi all,

I’m looking for some advice on tyre sizing for my CB750 K4. I’ve been doing some research (with a bit of help from ChatGPT), but I’d really like some human input from riders who’ve tried different setups.

My bike currently has:
Front: 4.10-19 (≈ 100/90-19)
Rear: 5.10-18 (≈ 130/90-18)

I’m planning to fit a set of Avon Roadrider MKII tyres, and I’m debating whether to stick close to stock or keep the slightly upsized look it already has. Here are the options I’m considering:

Option (A):
Front: 100/90-19
Rear: 120/90-18 (closer to stock)

Option (B):
Front: 100/90-19
Rear: 130/80-18 (chunkier look, slightly lower profile)

Option (C):
Something else entirely — if you’ve run different sizes that you feel work better, I’d love to hear.

--- End quote ---

Previously had Roadriders and then BT45's fitted.
Now have Michelin Road Classic, vast improvement  imho.

3.25B19 and 4.00B18.

https://www.motorcycletyrewarehouse.com.au/michelin-road-classic-pair-deal-325b19-400b18-freedelivery

 They look skinnier, but lighter handling on twists and roundabouts.

Good luck

Bryanj:
5.10 is way to big

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