I am looking for a simple biking computer(wireless with sensors) with large numbers for my new bike. This is my refence to see my current speed and Candence(maybe). I am not blind, but my current has smaller number(s) which is hard to read when I am sprinting.

I don't need a GPS reference and this is going my my new Trek Domane.

I am trying to stay away from my Iphone since it will not stay unlocked and overheats in the sun.

UPDATED: This is for a 2025 Trek Domane AL 5

You might look at the Bontrager RIDEtime Elite. It's sort of an old-school digital cyclocomputer, but it works with ANT+ sensors.

The numbers in the upper part of the display are pretty big.

On mine, I have it set up so that speed is in the larger, upper part of the display, and the smaller, lower part of the display shows cadence and heart rate.

My Wahoo Bolt allowed zoom capability, you could set up a data screen with the fewest number of fields and then zoom in. You could do this on a Garmin as well, just reduce the number of data fields.

If you are of an age where you have good eyesight, but you need readers to read close up, it is possible to buy sunglasses or safety glasses that have bifocal inserts for reading close up. I have been using such glasses for a decade and a half. Both in tinted (sun glasses) or for night and rain where I use clear or yellow safety glasses.

Most such glasses are safety glasses, but some are not. The sunglasses I currently use were from an on-line glasses store that specializes in readers and they are not safety glasses. The yellow tint ones I use for night or rain are safety glasses.

If interested, an internet search for bifocal safety glasses or bifocal sunglasses is a good start.

Lots available: Amazon.com : bicycle wireless computer with large display

Except for the cadence, the Cateye Padrone would fit the "large digits" wish.

If you do look at the GPS models of cyclometer, then probably all of them, and at least I know for sure Garmin Edges let you customize the screens with how many and what information is displayed. And allow for some fields to be larger than other. As well, if you only put a few fields on a screen, they will be sized larger to use the space not needed by stuff you aren't showing on that screen.

I bought Tifosi bifocal cycling sun glasses that make it easy to read my old Blackburn computers.

I know Wahoo can do this so I imagine Garmin can also. Create a page with just speed and cadence that should make it large enough to see while sprinting.

I saw you wrote "maybe" next to cadence, and I think this is appropriate. It's not as important as some people think. If the feature doesn't cost much, then it's fine to add it and monitor your cadence. But it isn't much of an indicator of your ability or effort. Just be sure it's not too low or high, and checking it with your eyes is good enough almost always.

I look almost exclusively at my cadence and wish it wasn't a tiny number at the bottom of my Cateye Strada Cadence's display which I have to squint to make out.
But then I've been slowly increasing my cadence as I discover the efficiency of spinning vs grinding.
I try to stay above 85, but when I stop thinking about it, it can easily drop down into the lower 70s.
I too would like a nice huge number, like it is for my speed. I don't really care how fast I'm moving forward.

The Beeline Velo 2 unit may be of interest to the OP. I don't think it supports peripheral sensors like for cadence, but it is very simple and offers a large, clear, speedo readout.

Velo2 requires pairing to a mobile phone for GPS speed and, if you're interested, live navigation.

https://beeline.co/products/beeline-...DfkTlMsjUnH6uF

I was happy with the Bontrager solution in the first response, for a time on my Trek hybrid, but on my new Synapse, it kept losing the link to the speed and cadence sensors. Replaced it with the new version of the least expensive Element Bolt. Love the upgrade. Not cheap though.