Help With Cycling & Long Acting Insulin

I'm not sure if anyone can help but I'm struggling to control my BG after I commute to work on my bike (each way the commute is 30.3km with 290m elevation) . I've tried reducing my long acting insulin by 4 units but this doesn't resolve the situation as I get spikes that I have to counter with short acting Novorapid.
Do I keep my long acting the same and counter with carb intake?

 

Thanks Juicyj, I have suffered with BG spikes and I try to leave like you with a raised BG up to 10mmol/l.
The problem I've been having is after getting to work last Friday I had a BG of 6.2mmol/l but 1 hour later it spiked to 13mmol/l with no carb intake, this mythed me and had to take Novorapid 4 units to
Bring back on track.
I don't usually test half way so may give this a try to see if any big drops are happening during the ride, although I don't feel bonked at any point.

 

Juicyj you may have resolved my issue, this morning I cycled to work and the halfway point is ironically at the top of the mountains so no more real climbing after this point.
I left home this morning after taking my Novorapid and eating my breakfast, with a BG of 11.6mmol/l. I stopped halfway 15.3km to take a BG test and was really shocked when I saw the result of 2.8mmol/l.
Thankfully I always carry my home made flapjacks on me and ate one then rode gently to remaining 15km.
Got to work and tested with a BG of 4.8mmol/l.
Does anyone have any experience of doing exercise first thing then having their breakfast and insulin after the workout?

 

Thank you Tim2000s, I'm trying my hardest to control this but it really is not straight forward, my BG level now is 6.7 and will be keeping tabs on an hourly basis to see if I can get any better clarity and make more informed decisions on my Long acting and short acting insulin levels.
Really does make you question what you have done and how can I make this better?

 

This is why I need a pump, today has been a nightmare but also lessons learnt.
I'm on pen not pump and last Friday I reduced my long acting insulin to 14 units before cycling to work, but found my sugars creeped up during the day. Last night I took 16 units of long acting insulin but my sugars plummeted from 11.6 to 2.8 whilst cycling in, restored my glucose levels with flapjack to 6.8, only yo find 2 hrs later it dropped to 2.9 again. I had a training meeting all afternoon and had to get my sugars up to 13 before entering and after the meeting (2hours later) sugar had dropped again to 4.8.
Really struggling with the cycling and BG control.
What is also annoying is the additional carbs I need to take to compensate for the exercise, which feels like it defeats the purpose of doing the exercise.

 

I'm currently trying my hardest to control my diabetes allot better but finding this really hard with Pen medication and also with my cycle commute to and from work.

Yesterday I commuted 60.9km overall (30.4 each way) and last night I had my evening meal and my BG maintained from 20:00hrs to 22:30 hrs @ 9mmol/L, maybe a little high but was happy with that as I was expecting a drop.

Due to my sugars dropping off whilst at work (19 blood tests carried out yesterday), last night I reduced my Lantus (Long Acting Insulin) by a further 2 units but have woken this morning at 5:40hrs with a glood glucose of 3.2mmol/L?

I've cycled in again today and reduced my NovoRapid (short acting) by 4 units, then ate my cereal (All Bran (75g) and Semi Skimmed milk(250ml)) 46g carbs in total. This allowed me to leave the house at 6:25hrs with a blood glucose of 6.0mmol/L, but after getting to the top of the climbs on my ride, at the halfway point (15km) I tested my sugar and had a reading of 2.8mmol/L, therefore I ate a bit of homemade flapjack (approx. 20g carbs) to give a boost and got to work with a BG of 5.1mmol/L at 7:45hrs. (perfect).

I've now seen a trend over the last 5 days, gained by closely monitoring my BG sugars with an average of 15 tests a day and to see the effects of the cycling, but really baffled by a definite trend i'm now seeing. My BG levels have spiked consistently an hour after I've got to work and today at 8:45hrs my sugar again rose to 11.4mmol/L?

Can anyone advise if this maybe the morning cereal (All bran) kicking in and should I eat my cereal first thing in the morning, then administer my Novorapid once I've arrived at work, to maybe help flat line the spikes?

 

Wow, thank you Tim2000s for the time you have put into the considered and fantastic response.
I've not tried the ride without breakfast and will give this a go tomorrow.
I was always led to believe that I need insulin in my system to allow the storage of the glucose on your muscles, should I completely drop the breakfast and Novorapid tomorrow and depend on the Lantus to maintain the BG.
I also agree that the Lantus is not right and may also be a factor, hence why the last 5 days I've been testing so much. On the weekend with 17 units my sugars were amazing , balanced within 4.3mmol/L to 7mmol/L. It's the cycling that really messes the control up.

 

So glad I joined this forum now, this is the first time in years that I've been able to get any sense on what's been going on.
I will start the basal rate test tomorrow (12hours after exercise) as the long acting is definitely having a strong affect on the proceedings on the days I'm cycling.
I've attached 2 images that show the results I was able to achieve on the weekend (2016-08-14 BG Levels) when a friend asked me to join him on a walk over the mountains, but although I had no pre-warning, with the extra intake of fast acting carbs like Kendal Mint Cake, had managed to control the day really well.
In comparison I have todays details showing the drops I'm now experiencing after the cycling (2016-08-16 BG Levels).

 

I'm driving in tomorrow due to rain and off on Thursday so can start the Basal Rate tests during these 2 days, hopefully if the weather is fine on Friday then I'll cycle in and will try no breakfast as this does seem to ****** proceedings up.
Now I'm back to the 5 range I feel allot better. and will be glad to maintain the target ranges if possible.

 

Thanks Noblehead for your reply, I'm going to trial the Basal Rate Fast and see if I can ensure that at least the Boluse level is correct, once this is defined I hope that at least I will have a better basis to get a much clearer understanding on what is going on.

 

Love to get hold of a Libre Freestyle or some CGM system, but unfortunately I cant afford £160 to get going.