We can highly recommend!
We have visited here two times and will absolutely come back again.
Great trails and good guides!
It is fabulous to exceed oneself!
Sirpa. (Re-posted from Sirpa's review on Facebook - Thanks for your kind words Sirpa)

We drove a very nice 3 days from Momtellano up to Olvera, Zahara and San Pedro. The route was very good and so were the guides, Clive, Nathalia and Alan. Our businessteam did very well and the stays in Olvera en especially Zahara were great.
Thanks
Marcel, Kees , Pieter and Wim

Spent an awesome 2 days biking with Simon. Amazing trails, guidance and even some tuition. All were so helpful and friendly. We had fantastic laughs with the gang. Definitely be back. Thanks for making our holiday guys xXx (Facebook Review-Thanks Pam)

Well this was my second mtb holiday with sierra and the rides just keep getting better thanks to Alan Bid, Simon Towner and the team for a fantastic week.
Roll on the next visit. (Facebook comment)

Cannot recommend these guys & girls enough... had the best week on the best trails with the best guides. There's a reason people come back year after year to this place & that's because Alan & his staff couldn't do more. Great breakfast. Bottomless fridge of beers, spirits & snacks & the best knowledge of the trails in the area... had THE best week I've had on a mountain bike. Cheers guys. Will be back .
Stephen.

White villages tour was possibly the best holiday I have ever had
Stuart Backhouse (Facebook comment)

Sierra's White Village tour - June 2017.
This was such fun. Blistering heat meant early starts most days, but with great riding and excellent company, who could complain ?
Day 1 was stunning wilderness (with a timely rescue by Alan and Mary in the van when the heat became too much for me).
Day 2 offered beautiful farmland and riverside, including a lovely swim stop, and ended at the best hotel pool in the world.
Day 3 was climbing and descending on loose and thrilling fire roads in unbelievably gorgeous mountain scenery.
And so it went on. Alan, Natalia and Clive were not only great guides but splendid company, as were Mary and Alexis who ferried us about and cooked breakfasts. Thanks to all for an amazing week.

Fantastic biking holiday last week at Sierra MTB.
Alan and the team were great, fab accommodation, location, knowledge of the area, guiding, supporting the group and overall brill fun !!
This together with the fact that they had MTBs in their workshop, on site, provided loads of flexibility and Alan even organised for us top Road Bikes for from of us to go road cycling!!
Would definitely come back and recommend to anyone !!

Craig

Can't fault the whole week. Simon, Josh, Nat and Alan to name a few were fantastic guides and great at bringing out your ability on a bike. Different riding everyday with fantastic lunch stops with food ready and waiting. Can't wait to book for next year
Kieth - Visited May 2017

Alan has a perfect setup with SierraMTB, exactly what I was after, great hospitality, accommodation & location.
Guiding by Simon spot on. He worked really hard to ensure everyone was enjoying the trails, offering good riding advice and spreading his time out across the group, top job.