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Thanks to everyone for the hints. I managed to finish before eating dinner, which my husband cooks on crossword day. I did find it hard.

I still can't see what the anagram is for 11ac, but I think I have the right answer. I also got 13d and it was my LOI, though once again I don't think it parses properly.

My FOI was 24ac and then 2D. My CODs are 8ac (took me ages), 26ac and 26d. I also liked 10ac and 17d.

11 is DURING ITS and I. I think it's a poor clue.

Yes, the first word of 11 is pretty clear given the "bike" part of the wordplay. But the second word seems odd and questionable.

11 is in Chambers as a two word expression, but it does seem to suggest that it is something worn when on a horse rather than a bike, hmm

I found this puzzle hard and couldn't have done it without your help - so many thanks. Like others, I didn't find the theme easy to spot.
Still have a few to finish but they'll have to wait till tomorrow. We lose an hour's sleep tonight to need to get my head down early.

Ahhh. I got sail for the second word. Apparently it is something you can attach to a motorcycle. No wonder I couldn't see the anagram.

I agree, Jono. If you consider the first word as its first definition, I.e the action of the verb to ****, and then look at the first definition of that, I think it might technically just about be okay. But the conventional use in speech would be equestrian, and most of the derived phrases are just that. So I think Qaos’s use is quite a stretch. If he was thinking of “Mamils” (Middle Aged Men In Lycra), I don’t think that what the definition means

Wow...

In Qaos's defense re. 11, I Googled the character string "motorcycle [solution to 11]"

I got a whole bunch of major vendor hits, for just one example

https://tinyurl.com/mu6ekbuj [tinyurl to avoid spoiler]

So it appears that the term 11 is in common parlance with the understanding that "bike"=motorcycle.

Thus IMO the clue is fine.

Like many others I didn't find this as easy as some. Started first thing Saturday morning ground to a halt 50% finished and went out for most of the day. Hence finishing Sunday morning. I just didn't know some of the clue references and I missed the 4,6 reference in 1d for ages despite having filled in the answer. I also don't get the base reference in 26d. I've never come across that usage in crosswords before that I can remember.

There were however some nice clues. I think despite my total blindness on it 1d would be my favourite.

Rocky, regarding the base, here's a somewhat recent Guardian Prize (Picaroon) - see 1 down. Also a mathematical theme, fwiw. ;-)

[Semi spoiler alert]

https://www.fifteensquared.net/2021/09/25/guardian-prize-28554-by-picaroon/